DS Probability

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DS Probability

by kguo » Tue Sep 29, 2009 10:46 pm
When a player in a certain game tossed a coin a number of times, 4 more heads than tails resulted. Heads or tails resulted each time the player tossed the coin. How many times did heads result?

(1) The player tossed the coin 24 times.

(2) The player received 3 points each time heads resulted and 1 point each time tails resulted for a total of 52 points.

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by sanjana » Wed Sep 30, 2009 2:51 am
This is a pretty Straight forward one.

Let the number of Heads be H
Number of tails be T

Given : H=T+4

Statement 1:
------------

H+T = 24
==> T+4+T=24
==>T=10

Therefore, H=14
Sufficient

Statement 2:
------------

3H+T=52
==>3(T+4)+T=52
Solve and you can find H and T

Sufficient

OA : D

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by vaibhav.iit2002 » Wed Sep 30, 2009 7:04 am
IMO D