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# ps: probability

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Senior Manager
Joined: 02 Feb 2004
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01 Jun 2005, 16:34
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pls explain
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Manager
Joined: 07 Mar 2005
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01 Jun 2005, 16:43
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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Director
Joined: 18 Apr 2005
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01 Jun 2005, 22:48
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, 01:44, edited 1 time in total.

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Manager
Joined: 05 May 2005
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Location: Kyiv, Ukraine

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02 Jun 2005, 01:16
from st. 2 prob b should be 1-.71=.29 so it's the same case as with A

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Senior Manager
Joined: 17 Apr 2005
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02 Jun 2005, 08:13
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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Manager
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02 Jun 2005, 16:40
ahah... yeah, should have thought about Statement B harder

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Senior Manager
Joined: 17 May 2005
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03 Jun 2005, 11:28
D for me too as prob of a happening is 0.25 and b is 0.29

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03 Jun 2005, 11:28
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