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I'm very skeptical about the second question; it says xy = 1, and then asks what 2(x+y)^2/2(x-y)^2 is equal to. Take x = 4 and y = 1/4 for example' xy = 1. (4+1/4)^2 = 18.0625. (4-1/4)^2 = 14.0625. When you divide 18.0625 by 14.0625, you do not get 16. Flag that question for review

by prindaroy

Sat Sep 19, 2009 11:10 am
Forum: GMAT Math
Topic: GMAT PREP Problems
Replies: 2
Views: 1377

1) The best way to solve this would not be through using the geometric progression formula. Too tedious. Best way to solve it is through intuition. First number is -1/2, next is 1/4, and then -1/8 and so on and so forth, so essentially when you add the first and second term you get -1/4, so the answ...

by prindaroy

Tue Sep 15, 2009 6:45 pm
Forum: Problem Solving
Topic: 2 Quant problems
Replies: 1
Views: 703

For the answer to your second question (the one with the attachment); It's 16P2 - 16 = 16!/14! - 16 = 240 - 16 = 224 Now 16P2 is essentially the total number of ways in which mike and the other guy can be arranged. 16 ways is the number of ways in which they ALWAYS sit across each other. There are 5...

by prindaroy

Tue Sep 15, 2009 6:25 pm
Forum: Problem Solving
Topic: pl solve ths..exam next week
Replies: 1
Views: 709

Picking numbers would actually be the most efficient strategy in my opinion. You could however reason this out but you have to be wary of this method. First, see that when you add the same thing to both the denominator and the numerator than the fraction will increase in value if the numerator is sm...

by prindaroy

Sun Sep 13, 2009 8:18 pm
Forum: Problem Solving
Topic: Inequality
Replies: 2
Views: 889

A,

-1/11, -1/12 .....

reciprocal =-11, -12, ------

by prindaroy

Sun Sep 13, 2009 3:32 pm
Forum: Problem Solving
Topic: PS - n reciprocal
Replies: 1
Views: 983

The above poster is wrong;

when t = 1

h = -16(1-3)2 + 150 = 214

when t = 0

h = 96 + 150 = 246

so, the question is a little messed up. Because there is nothing that says it will reach a max. height at 3. It could reach it at 1 second.

by prindaroy

Sun Sep 13, 2009 3:00 pm
Forum: Problem Solving
Topic: object thrown directly upward
Replies: 2
Views: 1103

yes the question is a little vague. So, essentially, for out of every 7, three play football as well? Are these the only people playing football? so if there are 70 rugby players then 30 of them play football as well and 40 play only rugby? And so, if 10% of the people play only rugby, then the peop...

by prindaroy

Sun Sep 13, 2009 2:44 pm
Forum: Problem Solving
Topic: Problem Solving for 780+ Aspirants.
Replies: 208
Views: 55850

statement B alone is sufficient; IMO we'll come to this; 5^2 * z = 3 * x^y, so we get that x^y = 25, 50, 75 or all multiples of 25, knowing that x is prime will show us that 5 is the only possible number that can achieve this; 15, 10 are not prime and cannot do that. So statement B alone is sufficie...

by prindaroy

Sun Sep 13, 2009 2:30 pm
Forum: Data Sufficiency
Topic: MGmat number properties
Replies: 7
Views: 1463

IMO D rule of divisibility for 3 is addition of numbers shud be multiple of 3....thus if ab multiple of 3 implies that a+b multiple of 3 statement 2 proves "a" multiple of 3 and "2b" multiple of 3 since 2 not divisible by 3 implies b divisible by 3... If a divisible by 3 and b divisible by 3 then a...

by prindaroy

Sun Sep 13, 2009 9:47 am
Forum: Data Sufficiency
Topic: MGMAT: multiples
Replies: 5
Views: 2396

D for first one. because AD = BC = 12. 2 * 3/8 = 3/4*12 = 9. Therefore 12 - 9 = 3. So 3 is the answer or D. For the second one then answer is 45 degrees, because 2x + 2x + 2x + (180 - 2x) = 360, x =45

by prindaroy

Sun Sep 13, 2009 7:54 am
Forum: Problem Solving
Topic: Triangle/Parallelogram
Replies: 8
Views: 1627

The answer should be 60. The answer 10 is very silly. The total number of possibilities = 120 and in half of them, Bob will finish ahead of Marge. So the answer is 60. 10 cannot be the answer because there are 5 different people in 5 different positions.

by prindaroy

Sat Sep 12, 2009 3:07 pm
Forum: Problem Solving
Topic: 5 people run a race and
Replies: 8
Views: 1751

solutions are,x = 2.5, -10, 5. There are only two of those in the set. So 2/12 or 1/6

by prindaroy

Sun Aug 23, 2009 4:11 pm
Forum: Problem Solving
Topic: Probability + Number sets
Replies: 3
Views: 3007

Okay, so ever number from 1 to 50 will divide h(100) right? But not one of those numbers will divide h(100)+1, because they already divide h(100). So the smallest number that will do so, has to be greater than 50. In the choices given, greater than 40 is the only choice that reflects our solution. S...

by prindaroy

Tue Aug 18, 2009 11:51 pm
Forum: Problem Solving
Topic: smallest prime
Replies: 5
Views: 1142

The answer E. this question has been asked before but I don't where the thread is but anyways;

h(100) = 2*4*6*................*100

= 2(1*2*3*4................*50)

so for a divisor of h(100) + 1, to happen, it would have to be greater than 50 or in this case 40.

by prindaroy

Tue Aug 18, 2009 12:03 pm
Forum: Problem Solving
Topic: smallest prime
Replies: 5
Views: 1142