Search found 298 matches
Value of n
Is n > 6?
1. sqrt(n) > 2.5
2.n > sqrt(37)
[spoiler]I see A is sufficient. However, when it comes to st 2 , n > sqrt(37) translates to n^2 > 6 . So n is either greater than 6 or less than -6. So the answer must be A right?[/spoiler]
- by Deepthi Subbu
Sun Sep 01, 2013 8:25 am- Forum: Data Sufficiency
- Topic: Value of n
- Replies: 13
- Views: 2126
Since every child is equally likely to be born, the probability of getting 2 girls and 2 boys is (1/2)^4 = 1/16.
Now the 2 girls and the two boys can be arranged in 4! ways. However G1G2B1B2 is the same as G2G1B1B2 and many other such combinations. So 4!/4(1/16) = 3/8.
Are you sure that OA is E?
- by Deepthi Subbu
Mon Aug 26, 2013 11:47 pm- Forum: Problem Solving
- Topic: Probability
- Replies: 7
- Views: 11346
- by Deepthi Subbu
Mon Aug 26, 2013 10:32 pm- Forum: Problem Solving
- Topic: Discount
- Replies: 2
- Views: 1312
Altitude or median
Hi,
Will the median or altitude divide a triangle in to 2 congruent triangles?
Or median always divide triangles in to 2 equal halves whereas altitude does it only in case of right triangles inscribed in a circle?
- by Deepthi Subbu
Mon Aug 26, 2013 10:30 pm- Forum: Problem Solving
- Topic: Altitude or median
- Replies: 1
- Views: 1196
Discount
An item is first discounted by 1 percent and then discounted by 2 percent. Then the price after both discounts, if the original price of the item is p, is p(1-0.01)(1-0.02). Is that right?
- by Deepthi Subbu
Sun Aug 25, 2013 8:40 am- Forum: Problem Solving
- Topic: Discount
- Replies: 2
- Views: 1312
consecutive integers
Let a be the sum of x consecutive positive integers. Let b be the sum of y consecutive positive
integers. For which of the following values of x and y is it NOT possible that a = b?
(A) x = 2; y = 6
(B) x = 3; y = 6
(C) x = 6; y = 4
(D) x = 6; y = 7
(E) x = 7; y = 5
- by Deepthi Subbu
Sun Aug 25, 2013 1:49 am- Forum: Problem Solving
- Topic: consecutive integers
- Replies: 4
- Views: 3480
- by Deepthi Subbu
Fri Aug 23, 2013 10:28 am- Forum: Data Sufficiency
- Topic: Modulus
- Replies: 2
- Views: 1337
Can we not assume the mortality rate for the year of 1970 as m, hence for 1972 it would be 0.92*0.92m and for 1976 0.92^6 m . So that wouldn't that be sufficient to calculate the percent decrease.
- by Deepthi Subbu
Thu Aug 08, 2013 2:23 am- Forum: Data Sufficiency
- Topic: Rate of decrease
- Replies: 4
- Views: 1840
Hi, The recursive function is Sn =Sn-1 +6. The direct function is Sn= 6n. So S13 = 6(13) = 78. S14 = 6(14).................... S28 = 6(28) So Sum = ( 6*13 + 6*14 + 6*15 + ................ 6*28) 6( 13+14+15+.............. +28) 6( (1+2+3+.....+28)-( 1+2+3+....13 ) ) = 1890 . However thats not the answ...
- by Deepthi Subbu
Sat Aug 03, 2013 12:56 am- Forum: GMAT Strategy
- Topic: Sequences
- Replies: 5
- Views: 6204
Even after we figure out that z>0, to find the if m is also > 0, we may substitute the value of z is each of the 2 equations - 1) m-3z > 0 Since m> 3z, m is greater than 0. Hence m+z>0. (2) 4z-m > 0 4z>m. Say z=1, m<4, so if m is negative say -10 , m+z < 0 Say m=3 , m<4, so m+z>0. Hence shouldnt the...
- by Deepthi Subbu
Sat Jul 27, 2013 4:13 am- Forum: Data Sufficiency
- Topic: Is m+z > 0?
- Replies: 22
- Views: 14169
Let x be the cities with maximum population. So for a city to have the least population, let me maximise x and also assume it is the same for all 10 cities.
So, 10(x) + .9(x) = 132000.
Whats wrong with my approach ?
- by Deepthi Subbu
Sat Jul 27, 2013 3:01 am- Forum: Problem Solving
- Topic: Question from Gmat Prep- Help please! 3
- Replies: 7
- Views: 3402
Q-The sum of the even numbers between 1 and n is 79*80, where n is an odd number, then n=? The answer i have is 79 whereas i m gettin 159... The problem becomes less tricky if you realize that 79*80 represents the formula for determining the sum of evenly spaced integers: Sum = (number of integers)...
- by Deepthi Subbu
Wed Jun 05, 2013 4:11 am- Forum: Problem Solving
- Topic: tricky one
- Replies: 12
- Views: 5156
Q-The sum of the even numbers between 1 and n is 79*80, where n is an odd number, then n=? The answer i have is 79 whereas i m gettin 159...[/quote] The problem becomes less tricky if you realize that 79*80 represents the formula for determining the sum of evenly spaced integers: Sum = (number of in...
- by Deepthi Subbu
Wed Jun 05, 2013 4:04 am- Forum: Problem Solving
- Topic: tricky one
- Replies: 12
- Views: 5156
- by Deepthi Subbu
Fri May 31, 2013 11:28 pm- Forum: Critical Reasoning
- Topic: Chess champion
- Replies: 5
- Views: 2128
Probability
My soln :
2/9*3/8 + 2/9*4/8 + 3/9*4/8 => 13/36 . However the answer is 13/18. Where am I going wrong?
Since order doesnot matter here, as azalea and then followed by buttercup is the same otherwise.And in addition to this if there are 3 ways to choose the placement, Il be in more trouble.
- by Deepthi Subbu
Fri May 31, 2013 11:07 pm- Forum: GMAT Math
- Topic: Probability Question
- Replies: 13
- Views: 4694