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Anindya Madhudor
Replies:
2
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655
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Probalility

Forum:
Problem Solving
Posted:
Sun Sep 08, 2013 7:32 am
The governor has decided to pardon one of the three prisoners (A, B, C) who are on death row and informs the prison warden about his decision. Prisoner A asks the warden which prisoner will be pardone ...
Anindya Madhudor
Replies:
4
Views:
1249
Thanks:
1
In 4 days, A completes 4/24 part of the whole work. Remaining work is 20/24 after 4 days.
When B joins after 4 days, A and B together do (1/24 + 1/32)*4 = 7/24. So remaining work after 8 days is (20/ ...
Anindya Madhudor
Replies:
3
Views:
1345
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0

Combination problem

Forum:
Problem Solving
Posted:
Sat Sep 07, 2013 7:46 am
If n balls are placed at random into n cells, find the probability that exactly one cell remains empty.

A. n/2n!
B. n!/n^n
C. (2n)!/n^n
D. (nC2)* n!/n^n
E. (nC2)* (2n)!/n^n

OA: D
Anindya Madhudor
Replies:
7
Views:
969
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0

legislature seems to talk at great length

Forum:
Sentence Correction
Posted:
Wed Dec 19, 2012 7:39 am
The legislature seems to talk at great length about reform but to do almost nothing to achieve that.

(A) to do almost nothing to achieve that
(B) to do almost nothing achieving such
(C) to do a ...
Anindya Madhudor
Replies:
2
Views:
541
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0

Does ab = a^2

Forum:
Data Sufficiency
Posted:
Tue Dec 18, 2012 10:41 pm
Statement I:

Possible solutions are a= b or a=-b. So, ab= a^2 or (-a^2). We cannot definitely answer the question. Not sufficient.

Statement II:

a^3 = b^3 means a=b. So, ab=a^2. Sufficient.
Anindya Madhudor
Replies:
3
Views:
1030
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0

grammatical rule

Forum:
Sentence Correction
Posted:
Tue Dec 18, 2012 10:30 pm
Can someone please explain the grammatical rule in solving the following question.

The guiding principles of the tax plan released by the Treasury department could have even a greater significance ...
Anindya Madhudor
Replies:
3
Views:
518
Thanks:
0

Inequality DS.

Forum:
Data Sufficiency
Posted:
Tue Dec 18, 2012 10:16 am
Statement I:

If R>4, e.g., 5 or 6, S <0 to satisfy the equation R + S =4. This is true for all values of R>4. So, sufficient.

Statement II:

S could be -3 or 3. We cannot definitely a ...
Anindya Madhudor
Replies:
3
Views:
773
Thanks:
0

unit digit problem

Forum:
Problem Solving
Posted:
Tue Dec 18, 2012 7:45 am
You need to find the pattern in the exponential.

When the last digit of any number is 3, you have the pattern 3, 9, 7, 1 for powers of 1, 2 ,3,4. This pattern repeats. So, it will be same for power ...
Anindya Madhudor
Replies:
3
Views:
518
Thanks:
0

Inequality DS.

Forum:
Data Sufficiency
Posted:
Tue Dec 18, 2012 7:33 am
Can you correct the question. Something is wrong in the first line.
Anindya Madhudor
Replies:
2
Views:
588
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0

Number Ds

Forum:
Data Sufficiency
Posted:
Tue Dec 18, 2012 7:23 am
Statement I:
22=2*11
15z= 3*5*z
15 and 22 do not have any common factors.
So, if 22 is a factor of 15Z, 22 has to be a factor of z.
Sufficient.

Statement II:
Same logic as before.
In this ca ...
Anindya Madhudor
Replies:
4
Views:
5960
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0
Let's analyze the first part of the given expression. 3^(4n + 2) can only have 9 as remainder when divided by 10. Pick any value to n to test this. The value of n is immaterial in this case.

To ev ...
Anindya Madhudor
Replies:
1
Views:
504
Thanks:
0

Speed Distance

Forum:
Problem Solving
Posted:
Sat Dec 15, 2012 1:37 pm
Train A leaves New York for Boston at 3 PM and travels at the constant speed of 100 mph. An hour later, it passes Train B, which is making the trip from Boston to New York at a constant speed. If Trai ...
Anindya Madhudor
Replies:
2
Views:
616
Thanks:
0

Distance Speed

Forum:
Problem Solving
Posted:
Sat Dec 15, 2012 1:29 pm
Stephanie, Regine, and Brian ran a 20 mile race. Stephanie and Regine's combined times exceeded Brian's time by exactly 2 hours. If nobody ran faster than 8 miles per hour, who could have won the race ...
Anindya Madhudor
Replies:
3
Views:
740
Thanks:
0
First, let's look at the given expression and try to express this as a product of prime factors.

450 y = n^3
=> 5^2 * 3^2 * 2 y =n^3

Since, n is an integer, let us find some of the possible ...
Anindya Madhudor
Replies:
2
Views:
631
Thanks:
0

Probability

Forum:
Problem Solving
Posted:
Fri Dec 14, 2012 11:09 am
Very confusing words indeed. Thank you. I was not thinking in that way.
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