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28-32

by magical cook » Thu Aug 30, 2007 12:32 pm
Seven different numbers are selected from the integers 1 to 100, and each number is divided by 7.
What is the sum of the remainders?
(1) The range of the seven remainders is 6.
(2) The seven numbers selected are consecutive integers.
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Re: 28-32

by ratindasgupta » Thu Aug 30, 2007 12:51 pm
magical cook wrote:Seven different numbers are selected from the integers 1 to 100, and each number is divided by 7.
What is the sum of the remainders?
(1) The range of the seven remainders is 6.
(2) The seven numbers selected are consecutive integers.
1) We know the range, but we dont know what the individual nos are. So INSUFF.

2) Since the numbers selected are consecutive, the remainders will always be the sum of numbers from 1 to 6. So SUFF.

Answer is B. [/b]
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by kajcha » Thu Aug 30, 2007 1:22 pm
Agree.. B
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by magical cook » Sat Dec 22, 2007 8:59 am
Sorry, I still think it's D... :cry:


for 1), 7 different numbers within 1-100 means the range of the 7 numbers 6? how about like 77, 22, 5, etc...
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by preciousrain7 » Sat Dec 22, 2007 5:45 pm
magical cook wrote:Sorry, I still think it's D... :cry:


for 1), 7 different numbers within 1-100 means the range of the 7 numbers 6? how about like 77, 22, 5, etc...
Hi, Can someone explain to me what does RANGE of 6 mean? TIA!
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by Tud » Sun Dec 23, 2007 4:27 pm
preciousrain7 wrote:
magical cook wrote:Sorry, I still think it's D... :cry:


for 1), 7 different numbers within 1-100 means the range of the 7 numbers 6? how about like 77, 22, 5, etc...
Hi, Can someone explain to me what does RANGE of 6 mean? TIA!
It means that the difference between the lowest and highest number is 6. The following sets of numbers all have a range of 6:

2, 3, 4, 5, 6, 7, 8
145, 147, 151
33, 33, 34, 35, 35.6, 37.5, 38, 39

As it applies to this problem, if the range of the remainder is 6 then the remainders have to be between 0 and 6, since you can't have a remainder of 7 or higher when dividing by 7. Knowing this is insufficient to give us the sum of the remainders because they could be 0, 0, 0, 0, 0, 0, 6 or 0, 6, 6, 6, 6, 6, 6, 6, which give us completely different sums.
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by magical cook » Sun Dec 23, 2007 5:41 pm
Thanks - :wink: yeah range dose not mean equally aart.... so it must be B.
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by gmatguy16 » Sun Jan 06, 2008 7:25 pm
imo D. any further discussions?
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by StarDust845 » Mon Jan 07, 2008 8:58 am
gmatguy16 wrote:imo D. any further discussions?
How can it be D? It must be B.
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by cris » Mon Jan 07, 2008 10:15 am
One question though....what about the numbers from 1-6 (both inclusive)??

I mean: 1/7...what is the remainder?? I belive the remander is the number that is left before starting with the decimals, right?
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by sankruth » Tue Jan 08, 2008 3:56 am
cris wrote:One question though....what about the numbers from 1-6 (both inclusive)??

I mean: 1/7...what is the remainder?? I belive the remander is the number that is left before starting with the decimals, right?
If you take 1, 2, 3, 4, 5, 6, 7

1/7 > Remainder = 1, (7 x 0 = 0)

2/7 > Remainder = 2 ...and so on till 6

7/7 > Remainder = 0

So, we have Remainers are {1,2,3,4,5,6,0}, which will be the same as the set of remainders for any set of 7 consequtive 7 numbers.
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by rajendrap471 » Tue Jan 08, 2008 7:29 am
sankruth wrote:
cris wrote:One question though....what about the numbers from 1-6 (both inclusive)??

I mean: 1/7...what is the remainder?? I belive the remander is the number that is left before starting with the decimals, right?
If you take 1, 2, 3, 4, 5, 6, 7

1/7 > Remainder = 1, (7 x 0 = 0)

2/7 > Remainder = 2 ...and so on till 6

7/7 > Remainder = 0

So, we have Remainers are {1,2,3,4,5,6,0}, which will be the same as the set of remainders for any set of 7 consequtive 7 numbers.

I think answer is D not B.
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by sirikesav » Tue Jan 08, 2008 3:07 pm
I go with the answer B.

Because the range of the remainders is 6 does not mean that all the remainders are completely different. there may be some remainders whihc are same or all remainders that are 6.

So A---- data insufficent

Hence I go with B.

Please correct me if I am wrong
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by gmatguy16 » Tue Jan 08, 2008 4:41 pm
i am sorry ,i incorrectly read the first statement as range of numbers instead of range of remainders, yes answer in that case should be b.
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by its_me07 » Wed Feb 06, 2008 1:16 pm
I think its D bcoz in the question stem it says that each number is divided by 7 (integers 1 - 100) and statment 1 says that remainder range shud b 6 so we can 7 numbers divide by 7 such that range is 6.

Any suggestions???
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