Search found 61 matches

by rishi235

Thu Aug 28, 2008 9:10 pm
Forum: Problem Solving
Topic: Gmat Prep?? (Prob)
Replies: 4
Views: 3628

Very nice explanation...
Thank you bomond....

by rishi235

Thu Aug 28, 2008 10:30 am
Forum: Data Sufficiency
Topic: GMAT Prep?? (Arithmetic Sequence)
Replies: 3
Views: 1854

IMO D.... :roll:
Not too confy with sets either....if someone can pls explain...

Thanks

by rishi235

Thu Aug 28, 2008 9:41 am
Forum: Data Sufficiency
Topic: DS
Replies: 5
Views: 1898

Yes E...coz v dunno whats the speed of Car X...

by rishi235

Thu Aug 28, 2008 9:35 am
Forum: Data Sufficiency
Topic: DS
Replies: 2
Views: 1483

I'm getting A

Heres wat I did:
a^2 = b^2
=> a = +/-b

From stmt 1)
ab=0
=> a=0 or b=0...
=> So irrespective of the sign of b, a = b = 0...SUFFICIENT

Please tell me where I'm going wrong...
Thanks

by rishi235

Thu Aug 28, 2008 9:04 am
Forum: Data Sufficiency
Topic: DS
Replies: 8
Views: 1995

I agree with pepe.....Ans is 25%...
Did wid the same method

by rishi235

Wed Aug 27, 2008 9:58 am
Forum: Problem Solving
Topic: A cube of white chalk
Replies: 8
Views: 4312

Nice work...
Just to add to ur collection:

Sum of squares of 1st n consecutive natural nos = n(n+1)(2n+1) / 6

Sum of cubes of the 1st n consecutive natural nos. = [n(n+1)/2]^2

by rishi235

Wed Aug 27, 2008 9:53 am
Forum: GMAT Math
Topic: Formula for consecutive, even, odd integers
Replies: 12
Views: 658725

@ pepeprepa Why did u take pi*(r + s)??? It shud be pi*(r-s) The area of the shaded portion is Area of the entire circle - Area of the white portion Now radius of the white portion = r-s & not r+s So area of the shaded portion is pi*r^2 - pi*(r-s)^ U'll get the ans as E Hope u understood ur mist...

by rishi235

Wed Aug 27, 2008 9:48 am
Forum: Problem Solving
Topic: GMATPrep - area metal frame?
Replies: 5
Views: 1697

5^21 x 4^11= 2 x 10^n
Now 2 x 10^n = 2*5^n*n^n = 2^(n+1)*5^n
Equate with LHS....
U'll get n=21

by rishi235

Wed Aug 27, 2008 7:57 am
Forum: Problem Solving
Topic: Gmat Prep(exponents)!!!
Replies: 2
Views: 1408

@ 4meonly... I guess ur assumption x=3*9^4 does not satisfy the 2nd condition Now x^x = y^2 => y = x^(x/2) => (3*9^4) ^ [(3*9^4)/2] => Now 3*9^4 / 2 is not an integer Hence Integer ^ Non-integer does not = Integer...so (3*9^4) ^ [(3*9^4)/2] is not an integer... Hence this does not satisfy the 2nd co...

by rishi235

Tue Aug 26, 2008 8:40 am
Forum: Problem Solving
Topic: Data Sufficiency
Replies: 10
Views: 1950

Confused yet again!!!

Hi... Why don't v take 8P4 here as the arrangement is important here? Also, on the other hand, if we take 8C4...i.e. v r selecting 4 DISTINCT balls from 8 balls...we do not need to re-arrange the balls in ascending as they r in ascending order...Ok got this but still the arrangement is important rig...

by rishi235

Tue Aug 26, 2008 7:33 am
Forum: Problem Solving
Topic: counting in arrangement
Replies: 9
Views: 1955

I also got the right answer using pepeprepa's method but took ages to get to the answer
U just gave us a great method sudhir....Thanks

by rishi235

Mon Aug 25, 2008 10:11 am
Forum: Problem Solving
Topic: TSD
Replies: 10
Views: 5494

oh i get my mistake ...Thanks 4meonly...

I solved the problem using mals24's method...got 720 too ... :roll:

by rishi235

Mon Aug 25, 2008 9:52 am
Forum: Problem Solving
Topic: Probability
Replies: 15
Views: 4899

Hi... I also got 7...which is the average of the no. of marbles.. But i do not think its the right answer... @ chase... I guess we need the find the least no. of marbles 'exchanged'... I just substituted the values as 0 , 5 , 9 & 14... So all the boys to have 7 marbles... we need to exchange 7+2...

by rishi235

Mon Aug 25, 2008 9:46 am
Forum: Problem Solving
Topic: Algebra
Replies: 6
Views: 1784

Wow....
I'm getting the answer as 1) 30....hehehe

Heres my working...
2C1 * 6C4 = 30...
Can't get it...

Thanks.... :)

by rishi235

Mon Aug 25, 2008 9:26 am
Forum: Problem Solving
Topic: Probability
Replies: 15
Views: 4899