Search found 425 matches
- by LalaB
Tue Nov 20, 2012 9:47 pm- Forum: Problem Solving
- Topic: Set
- Replies: 3
- Views: 1295
I am not a wife,but I already posted the rule for divisibility by 11
the quickest method is to guess and move on (kidding!)
Brent, I liked ur post. This shows again that most of the gmat questions can be solved in multiple ways. that is why we love (do we!? I am a liar hehe) the gmat )))
- by LalaB
Thu Oct 18, 2012 10:07 am- Forum: Problem Solving
- Topic: divisible by 11
- Replies: 8
- Views: 4300
answer choice C says n minus 100 ; 14444-100=14344 it is divisible by 11 (check it by summing up digits in odd places,then digits in even places. if the sum of digits in odd places is equal to the sum of digits in even places, then the number is divisible by 11) 1+3+4=4+4 so, 14544 is divisible by 1...
- by LalaB
Wed Oct 17, 2012 9:35 pm- Forum: Problem Solving
- Topic: divisible by 11
- Replies: 8
- Views: 4300
one more solution-
average= (last term+first term)/2=(A160th+A1)/2
note that we have the following set-
6 9 12 15 etc
it means we have multiple of 3 plus 3 . a1=1*3+3=6 a2=2*3+3=9 etc
so, A160=160*3+3=483
(483+6)/2=244.5
- by LalaB
Thu Oct 04, 2012 7:56 am- Forum: Problem Solving
- Topic: Average | Manhattan strategy guides
- Replies: 9
- Views: 2780
let the radius of a circle be x since the triangle is equilateral, its angle is equal to 60degree the bottom of the triangle is 2x, the diagonal is x*sqroot3 the area of the triangle =2x*x*sqroot3/2=(x^2)*sqroot3 the area of the sector of a cirle =(60/360)*pi*x^2=(1/6)*pi*x^2 so we have - (x^2)*sqro...
- by LalaB
Mon Oct 01, 2012 11:56 pm- Forum: Problem Solving
- Topic: 3 Tangent circles
- Replies: 2
- Views: 6809
Well now I get a ans , can someone clarrify what Im doing wrong here. Using slot method. 1st slot : select 1 women from 8 ppl out of 5 women = 5/8 2nd slot : selecting 2nd women = 4/7 3rd slot : selecting 1 man from remaining ppl out of 3 men = 3/6 4th slot : selecting 2nd man = 2/5 5/8*4/7*3/6*2/5...
- by LalaB
Mon Oct 01, 2012 11:24 pm- Forum: Problem Solving
- Topic: A small company employs 3 men and 5 women. If a team of 4 em
- Replies: 12
- Views: 14058
- by LalaB
Mon Oct 01, 2012 8:58 am- Forum: Problem Solving
- Topic: permutation
- Replies: 7
- Views: 5374
- by LalaB
Mon Oct 01, 2012 8:41 am- Forum: Problem Solving
- Topic: Probability/ combination
- Replies: 6
- Views: 3036
- by LalaB
Mon Oct 01, 2012 8:33 am- Forum: Problem Solving
- Topic: Mechanics Question
- Replies: 25
- Views: 12217
- by LalaB
Mon Oct 01, 2012 1:53 am- Forum: Problem Solving
- Topic: Probability - balls - need expert help
- Replies: 6
- Views: 1622
1)
4^(x+1)-4^(x-1)>100
4^(x+1)-4^x/4>100
(4^x)*4*4-4^x>400
4^x(16-1)>400
(4^x)*15> 400
26<4^x<100
x=3
2) 4^(x + 1) + 4^x > 100
4^x(4+1)>100
4^x>20
20<4^x<100
x=3
ans is D
- by LalaB
Thu Sep 27, 2012 7:40 am- Forum: Data Sufficiency
- Topic: confused with this DS
- Replies: 6
- Views: 1518
can you please keep track of my questions , Am suffering a lot lately due to combinations, would really appreciate your help ( have also asked @kanwar for his assistance). I have found quite a few combinotrics questions whose solutions I am not sure about, Hope I will be able to find help in this c...
- by LalaB
Thu Sep 06, 2012 6:53 am- Forum: Problem Solving
- Topic: Nine dogs are split into 3 groups to pull one of three sled
- Replies: 8
- Views: 1981
u r welcome. glad to be helpful, and good luck with ur studygmatter2012 wrote:Thank you LalaB, these formula's, Good to know.
- by LalaB
Thu Sep 06, 2012 6:44 am- Forum: Problem Solving
- Topic: Nine dogs are split into 3 groups to pull one of three sled
- Replies: 8
- Views: 1981
well, yes, in this case order is important. Remember- if u want to get m groups, each containing n objects, and order matters, then use the formula - (mn)!/(n!)^m so, in this case we have (3*3)!/(3!)^3 if u want to get m groups, each containing n objects, and order doesnt matter, then use the formul...
- by LalaB
Thu Sep 06, 2012 12:49 am- Forum: Problem Solving
- Topic: Nine dogs are split into 3 groups to pull one of three sled
- Replies: 8
- Views: 1981
see the reference- the title of this topic is Ä°an pliz! but the post is "Ä° need an ans!" and this sign (!) is scary :) Ian, if u dont answer within next 24 hours, I feel u will be sued for not answering :) we ,females, always need men to answer to our questions, such as- when did u come ...
- by LalaB
Wed Sep 05, 2012 10:38 am- Forum: Lounge
- Topic: Ian...plz rply!
- Replies: 11
- Views: 2575