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ps: probability

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Senior Manager
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ps: probability [#permalink] New post 01 Jun 2005, 15:34
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
pls explain
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Manager
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 [#permalink] New post 01 Jun 2005, 15:43
Independent events. Probability of both happening = prob(a) * prob(b)

since A = 25% even if B= 100%

.25 * 1 = .25 < .3

So A is sufficient to answer the question. No matter what B is, the probability of both occurring cannot be greater than 30%.
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 [#permalink] New post 01 Jun 2005, 21:48
oops, mistake, D instead of A, agree with july


1) .25 * another prob <=.25
2) prob of B is (1-.71)=.29 (not .69) same

Last edited by sparky on 02 Jun 2005, 00:44, edited 1 time in total.
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 [#permalink] New post 02 Jun 2005, 00:16
from st. 2 prob b should be 1-.71=.29 so it's the same case as with A

the answer should be D
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Re: ps: probability [#permalink] New post 02 Jun 2005, 07:13
mirhaque wrote:
pls explain


I too vote for D.

Well, since we know that probabilities of each of them happening is less than 0.3 , there is no way that both of them can happen with a probability of more than 0.3. So either statement is sufficient.

HMTG.
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 [#permalink] New post 02 Jun 2005, 15:40
ahah... yeah, should have thought about Statement B harder
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 [#permalink] New post 03 Jun 2005, 10:28
D for me too as prob of a happening is 0.25 and b is 0.29
  [#permalink] 03 Jun 2005, 10:28
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