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# Abe, Beth and Carl each start to write a science fiction book.

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Re: Abe, Beth and Carl each start to write a science fiction book. [#permalink]
What if the question asked, "What is the probability that Beth or Carl will get their book published?"

Would we still subtract the "Both" part ? I am confused about why the "Both" part is even needed?

chetan2u

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Re: Abe, Beth and Carl each start to write a science fiction book. [#permalink]
Mugdho wrote:
What if the question asked, "What is the probability that Beth or Carl will get their book published?"

Would we still subtract the "Both" part ? I am confused about why the "Both" part is even needed?

chetan2u

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Hi

You subtract BOTH when there is possibility of both happening together and is included in each case.

For example
When you choose P of Beth, it will contain when B publishes and C does not, and also when both B and C publish their books.
When you choose P of C, it will contain when C publishes and B does not, and also when both B and C publish their books.
So, both cases above contain 'both B and C', so it has to be subtracted once from total.
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Re: Abe, Beth and Carl each start to write a science fiction book. [#permalink]
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Re: Abe, Beth and Carl each start to write a science fiction book. [#permalink]
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