Search found 25 matches
Arthimatic Progression...............
In a flower bed, there are 23 rose plants in the first row, 21 in the second, 19 in the third, and so on. There are
5 rose plants in the last row. How many rows are there in the flower bed?
(a)23
(b)20
(c)7
(d)10
please help me........ how to solve it.....
- by sheelanadh
Wed Aug 11, 2010 10:57 pm- Forum: Problem Solving
- Topic: Arthimatic Progression...............
- Replies: 3
- Views: 1071
In a room filled with 7 people, 4 have 1 sibling and 3 have two siblings. If two people at selected at random what is the prob that they are not siblings. Answer is 6/21 Can someone explain. 4 people have 1 sibling means there are 2 pairs of siblings. Let A and B be the siblings, and C and D be the...
- by sheelanadh
Wed Aug 11, 2010 4:24 am- Forum: Problem Solving
- Topic: Siblings
- Replies: 2
- Views: 1061
Please answer and clarify why and how to solve such a question: I will appreciate if the experts (instructors) here can definitely clarify this for posterity's sake: There are 3 white 3 black and 2 red balls. 1. Balls are drawn one by one WITH replacement: What is the probability that the third bal...
- by sheelanadh
Wed Aug 11, 2010 4:22 am- Forum: Problem Solving
- Topic: Probability Question: Please Experts, settle once & for
- Replies: 6
- Views: 1311
1 standard deviation = 3 2 standard deviations = 3*2 = 6 2.5 standard deviations = 3*2.5 = 7.5 Standard deviation represents the average deviation of all members of the set from the mean of that set. This means that we are looking for a number that is more than 7.5 units away from 20. => 12 (which ...
- by sheelanadh
Wed Aug 11, 2010 4:19 am- Forum: Problem Solving
- Topic: Mean and Median
- Replies: 4
- Views: 1309
Since the length of n is 6 and having more prime factors,lets take the small prime factor 2. n=2*2*2*2*2*X we can sub X=2,n=64 X=3,n=96 X cannot be greater than 3 as n is a two digit positive integer. n=2^5*x[x=2 or 3] So 2 positive integers have length 6. thank you very much ........is there any m...
- by sheelanadh
Wed Aug 11, 2010 4:13 am- Forum: Problem Solving
- Topic: ShortCut
- Replies: 2
- Views: 988
Hi, Interesting q ... Thanks. I thought the best ways was to assume values for b in the 2nd equation Let b = -5; The equation becomes 2x^2-5x+2=0 Roots are 1/2 or 2. Roots of 1st equation are 3/2 or 3 try to form the 1st equation (x-3/2) (x-3) = 0 Make sure that the coefficients of x match in both ...
- by sheelanadh
Wed Aug 11, 2010 4:03 am- Forum: Problem Solving
- Topic: kindly explain me how to solve it............
- Replies: 4
- Views: 852
Find the number of rectangles excluding squares from a rectangle of size 9X6. help me please.......... Again the question is not clear. Whats the source? Integer sides for the rectangle?? question is correct...........this is from local institute....please help me to solve this problem...... I real...
- by sheelanadh
Wed Aug 11, 2010 3:59 am- Forum: GMAT Math
- Topic: can anyone please explain this GMAT problem
- Replies: 7
- Views: 2215
this is not too hard but very time-consuming from digits 1,2,3,4,5 using digits only once we can form 5!=120 numbers when we sum all numbers each digit in all numbers will appear exactly 120/5=24 times 1*24+2*24+3*24+4*24+5*24=360 and now let us sum 12345 12354 12543 .......... .......... ............
- by sheelanadh
Wed Aug 11, 2010 1:40 am- Forum: Problem Solving
- Topic: help me to solve it
- Replies: 6
- Views: 1026
help me to solve this ps problem
If ^nP_r=30240 and ^nC_r=252 the the ordered pair (n,r) is equal to
(a)(12,6)
(b)(10,5)
(c)(9,4)
(d)(16,7)
- by sheelanadh
Tue Aug 10, 2010 10:02 pm- Forum: Problem Solving
- Topic: help me to solve this ps problem
- Replies: 3
- Views: 1490
your assumption is correct ,but will explaining it is little bit confusing please explain me clearly ...........in simple method ......... Well, this problem is a bit difficult to explain. I found this link which has a detailed solution. http://www.manhattangmat.com/forums/permutation-and-combinati...
- by sheelanadh
Tue Aug 10, 2010 3:18 am- Forum: Problem Solving
- Topic: Permutation & Combination
- Replies: 4
- Views: 991
Hi guys. This is a tricky one for me. If two of the four expressions x+y,x+5y, x-y, x-5y are to be selected at random, what is the probability that their product is equal to x^2 - (by)^2 where b is an integer. a.1/2 b.1/3 c.1/4 d.1/5 e.1/6 x^2 - (by)^2 = (x + by)(x - by), which clearly implies that...
- by sheelanadh
Tue Aug 10, 2010 3:08 am- Forum: Problem Solving
- Topic: Probability and algebra
- Replies: 5
- Views: 1031
clock60 wrote:x55, 8 numbers ( x is any digit exept 0 and 5. 8*1*1)
5x5, 9 numbers ( x any number exept 5. 1*9*1)
55x, 9 numbers ( x any number exept 5 1*1*9)
total=8+9+9=26
my pick for B
thank you........can u explain me little bit clear explination.....
- by sheelanadh
Tue Aug 10, 2010 3:05 am- Forum: Problem Solving
- Topic: Permutation Problem
- Replies: 5
- Views: 1127
In how many ways 5 different balls can be arranged in to 3 different boxes so that no box remains empty? help me in solving these.............. (1) 1 ball can be placed in 2 boxes each and 3 balls can be placed in the 3rd box. There are 3 ways in which we can do so. This can be done in 3 * [5C1 * 4...
- by sheelanadh
Tue Aug 10, 2010 2:58 am- Forum: Problem Solving
- Topic: Permutations and Combinations
- Replies: 8
- Views: 1837
Find the sum of all five digit number that can be formed using the digits 1,2,3,4 and 5 (repetition of digits not allowed)selango wrote:sheelanadh,
Always post the answer options for the PS question.
a)3999960.
b)5273222.
c)3777660.
d)3998900.
please help me to solve it........
- by sheelanadh
Tue Aug 10, 2010 2:53 am- Forum: Problem Solving
- Topic: help me to solve it
- Replies: 6
- Views: 1026
kvcpk wrote:Again the question is not clear. Whats the source?sheelanadh wrote:Find the number of rectangles excluding squares from a rectangle of size 9X6.
help me please..........
Integer sides for the rectangle??
question is correct...........this is from local institute....please help me to solve this problem......
- by sheelanadh
Tue Aug 10, 2010 2:48 am- Forum: GMAT Math
- Topic: can anyone please explain this GMAT problem
- Replies: 7
- Views: 2215