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What is the probability that event E or event F or both will

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Manager
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What is the probability that event E or event F or both will [#permalink]

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New post 09 Oct 2008, 06:16
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What is the probability that event E or event F or both will occur?
(1) The probability that event E will occur is 0.6.
(2) The probability that event F will occur is 0.4.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.
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Re: event [#permalink]

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New post 09 Oct 2008, 06:18
are they mutual?

i think there is some problem in question.. i am getting prob. > 1

0.6 + 0.4 + 0.6 *0.4 > 1 which is not write..

please shed some light boss..
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Re: event [#permalink]

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New post 09 Oct 2008, 16:34
okay,

the prob is 1- "the prob of something else happens"

by having both probabilities (.6 + .4 = 1) we know that there are only two events and no other, third event, can happen.

therefore the answer is C. either this or there is something wrong with the Question..!
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Re: event [#permalink]

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New post 09 Oct 2008, 18:16
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What is the probability that event E or event F or both will occur?
(1) The probability that event E will occur is 0.6.
(2) The probability that event F will occur is 0.4.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient

Here is my answer
Formula for event EUF i.e (either event E or event f or both occur) = E + F - (E&F)

In above, we are not provided with (E&F) therefore, answer is E i.e statement 1 and 2 are not sufficient.
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Re: event [#permalink]

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New post 09 Oct 2008, 23:34
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Agree with the approach from sudhanshu_arora. Answer should be E.
Re: event   [#permalink] 09 Oct 2008, 23:34
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