If M and N are integers,is (10^M+N)/3 an integer?
1.N=5
2.MN is even
M and N
- goyalsau
- Legendary Member
- Posts: 866
- Joined: Mon Aug 02, 2010 6:46 pm
- Location: Gwalior, India
- Thanked: 31 times
Saurabh Goyal
[email protected]
-------------------------
EveryBody Wants to Win But Nobody wants to prepare for Win.
[email protected]
-------------------------
EveryBody Wants to Win But Nobody wants to prepare for Win.
- shovan85
- Community Manager
- Posts: 991
- Joined: Thu Sep 23, 2010 6:19 am
- Location: Bangalore, India
- Thanked: 146 times
- Followed by:24 members
Any integer power of 10 when divided by 3 the remainder will be 1. so there will be always a case of fraction. How can we see the options as we have a definite answer before going to options?
Hence IMO D Not sure
Hence IMO D Not sure
- goyalsau
- Legendary Member
- Posts: 866
- Joined: Mon Aug 02, 2010 6:46 pm
- Location: Gwalior, India
- Thanked: 31 times
shovan85 wrote:Any integer power of 10 when divided by 3 the remainder will be 1. so there will be always a case of fraction. How can we see the options as we have a definite answer before going to options?
Hence IMO D Not sure
OA is E
I marked A
Because i think any power of 10 will be like 10, 100, 1000, 10000 ......
now if we add 5 to it even then it will be divisible by 3 like 105, 1005, 10005..
If MN is even than we can't figure out much because it can be even * even or even * odd.
so thought its not enough.
I am not able to understand why answer is not A
Saurabh Goyal
[email protected]
-------------------------
EveryBody Wants to Win But Nobody wants to prepare for Win.
[email protected]
-------------------------
EveryBody Wants to Win But Nobody wants to prepare for Win.
- shovan85
- Community Manager
- Posts: 991
- Joined: Thu Sep 23, 2010 6:19 am
- Location: Bangalore, India
- Thanked: 146 times
- Followed by:24 members
Oh My God!! I have taken it as 10^(M+N) not (10^M)+N..... LOL thats why it was not making sensegoyalsau wrote:shovan85 wrote:Any integer power of 10 when divided by 3 the remainder will be 1. so there will be always a case of fraction. How can we see the options as we have a definite answer before going to options?
Hence IMO D Not sure
OA is E
I marked A
Because i think any power of 10 will be like 10, 100, 1000, 10000 ......
now if we add 5 to it even then it will be divisible by 3 like 105, 1005, 10005..
If MN is even than we can't figure out much because it can be even * even or even * odd.
so thought its not enough.
I am not able to understand why answer is not A
- shovan85
- Community Manager
- Posts: 991
- Joined: Thu Sep 23, 2010 6:19 am
- Location: Bangalore, India
- Thanked: 146 times
- Followed by:24 members
U r right!! Be sure u do it from an official source.goyalsau wrote:shovan85 wrote:Any integer power of 10 when divided by 3 the remainder will be 1. so there will be always a case of fraction. How can we see the options as we have a definite answer before going to options?
Hence IMO D Not sure
OA is E
I marked A
Because i think any power of 10 will be like 10, 100, 1000, 10000 ......
now if we add 5 to it even then it will be divisible by 3 like 105, 1005, 10005..
If MN is even than we can't figure out much because it can be even * even or even * odd.
so thought its not enough.
I am not able to understand why answer is not A
- reply2spg
- Legendary Member
- Posts: 1261
- Joined: Sun Sep 14, 2008 3:46 am
- Thanked: 27 times
- GMAT Score:570
question must be written properly.
It is actually ((10^M)+N)/3 is integer?
IMO answer should be A.
It is actually ((10^M)+N)/3 is integer?
IMO answer should be A.
goyalsau wrote:If M and N are integers,is (10^M+N)/3 an integer?
1.N=5
2.MN is even
Sudhanshu
(have lot of things to learn from all of you)
(have lot of things to learn from all of you)
-
- Master | Next Rank: 500 Posts
- Posts: 265
- Joined: Mon Dec 28, 2009 9:45 pm
- Thanked: 26 times
- Followed by:2 members
- GMAT Score:760
I think it is a pretty good question with all its traps. I DO NOT think it should be written with any more or any less sighs, brackets etc....why? Well one should know that 10^m has to be solved before adding ........goyalsau wrote:If M and N are integers,is (10^M+N)/3 an integer?
1.N=5
2.MN is even
1 - (10^m+n)/3, always try to break the fraction and see the individual components. 10^m/3 + n/3 will it be an integer? we know that 10^m will always give us a remainder of 1. if n = 5 we are done, the remainder for 10^m+n = 0.
2 - mn even does not tell anything. we could have m = 2, n = 2 remainder is 0. m = 3 n = 4, remainder not zero........
Hence A solves it.
Call me 1 - (412) 897 6727 (US) or leave a msg on BTG for GMAT advise / questions.
If you like the solution, check out my debrief at and leave a comment:
https://www.beatthegmat.com/760-done-dea ... 66740.html
If you like the solution, check out my debrief at and leave a comment:
https://www.beatthegmat.com/760-done-dea ... 66740.html
It has to be option E:
It says just integers may be positive or negative.
Option 1 works fine for positive integers and for the other scenario it doesn't
Option 2 can be eliminated as discussed in the above posts.
It says just integers may be positive or negative.
Option 1 works fine for positive integers and for the other scenario it doesn't
Option 2 can be eliminated as discussed in the above posts.
-
- Master | Next Rank: 500 Posts
- Posts: 265
- Joined: Mon Dec 28, 2009 9:45 pm
- Thanked: 26 times
- Followed by:2 members
- GMAT Score:760
Excellent point!narik11 wrote:It has to be option E:
It says just integers may be positive or negative.
Option 1 works fine for positive integers and for the other scenario it doesn't
Option 2 can be eliminated as discussed in the above posts.
Agreed it is E.
Call me 1 - (412) 897 6727 (US) or leave a msg on BTG for GMAT advise / questions.
If you like the solution, check out my debrief at and leave a comment:
https://www.beatthegmat.com/760-done-dea ... 66740.html
If you like the solution, check out my debrief at and leave a comment:
https://www.beatthegmat.com/760-done-dea ... 66740.html
-
- Legendary Member
- Posts: 1119
- Joined: Fri May 07, 2010 8:50 am
- Thanked: 29 times
- Followed by:3 members
i hate it when you guy dont post precise questiongoyalsau wrote:If M and N are integers,is (10^M+N)/3 an integer?
1.N=5
2.MN is even
is it (10^M)+N or 10^(M+N)??????
-
- Master | Next Rank: 500 Posts
- Posts: 265
- Joined: Mon Dec 28, 2009 9:45 pm
- Thanked: 26 times
- Followed by:2 members
- GMAT Score:760
It is neither!diebeatsthegmat wrote:i hate it when you guy dont post precise questiongoyalsau wrote:If M and N are integers,is (10^M+N)/3 an integer?
1.N=5
2.MN is even
is it (10^M)+N or 10^(M+N)??????
If M and N are integers,is (10^M+N)/3 an integer?
hence solve 10^m first add n to it and then finally divide the whole by 3 OR break the fraction apart which will read as 10^m/3 + n/3 again by basic math rules we will solve the exponent first then divide by 3 and solve n/3 first and then add the two parts.
The question is clear!
Cheers
Call me 1 - (412) 897 6727 (US) or leave a msg on BTG for GMAT advise / questions.
If you like the solution, check out my debrief at and leave a comment:
https://www.beatthegmat.com/760-done-dea ... 66740.html
If you like the solution, check out my debrief at and leave a comment:
https://www.beatthegmat.com/760-done-dea ... 66740.html
-
- Master | Next Rank: 500 Posts
- Posts: 265
- Joined: Mon Dec 28, 2009 9:45 pm
- Thanked: 26 times
- Followed by:2 members
- GMAT Score:760
As shown in posts above the questions is -uwhusky wrote:The issue is that the question was not written correctly.
(10^M)+N and 10^(M+N) are VERY different.
(10^M+N)/3
I do not see any confusion with that.
The question is neither of (10^M)+N nor 10^(M+N)
We can simply apply PEMDAS - Parenthesis > Exponents > Multiplication > Division > Addition > Subtraction
to solve this clinically......
Anyways I am thick or something, but that is how I have been doing maths all my life, and I have been pretty good so far
Call me 1 - (412) 897 6727 (US) or leave a msg on BTG for GMAT advise / questions.
If you like the solution, check out my debrief at and leave a comment:
https://www.beatthegmat.com/760-done-dea ... 66740.html
If you like the solution, check out my debrief at and leave a comment:
https://www.beatthegmat.com/760-done-dea ... 66740.html
-
- Master | Next Rank: 500 Posts
- Posts: 265
- Joined: Mon Dec 28, 2009 9:45 pm
- Thanked: 26 times
- Followed by:2 members
- GMAT Score:760
I am not trying to get in an argument here, but was perplexed as to how we (many people) in the group could not understand the question as is.uwhusky wrote:Since GMAT isn't written in symbols, whether this question was written correctly is besides the point. Obviously there's some confusion whether it's 10 ^(M+N) or (10^M) + N, and I guess you knew all along. Whoopee for you!
As for the part about GMAT not being in symbols - there are so many questions that use symbols on this forum and I do not remember any of them being an issue earlier. I still do not know how to superscript / subscript numbers, variables on the forum.
Cheers
Call me 1 - (412) 897 6727 (US) or leave a msg on BTG for GMAT advise / questions.
If you like the solution, check out my debrief at and leave a comment:
https://www.beatthegmat.com/760-done-dea ... 66740.html
If you like the solution, check out my debrief at and leave a comment:
https://www.beatthegmat.com/760-done-dea ... 66740.html
- goyalsau
- Legendary Member
- Posts: 866
- Joined: Mon Aug 02, 2010 6:46 pm
- Location: Gwalior, India
- Thanked: 31 times
sharp thinking...narik11 wrote:It has to be option E:
It says just integers may be positive or negative.
Option 1 works fine for positive integers and for the other scenario it doesn't
Option 2 can be eliminated as discussed in the above posts.
It is really important to recall the basics,
You did it pretty well.
Thanks..
Saurabh Goyal
[email protected]
-------------------------
EveryBody Wants to Win But Nobody wants to prepare for Win.
[email protected]
-------------------------
EveryBody Wants to Win But Nobody wants to prepare for Win.