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wrt1mea

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Probability of getting pregnant

OK, this is a math probability question.

We had a safety meeting this morning where a gentlemen said that he is having his third grandson after his son had a vasectomy and his son's wife had her tubes tied. A quick search says that 1/100 vasectomies will fail and 5/1000 Tubal Ligations will fail.

The question is, how do you combine the probabilites. An explanation would be awesome because I am deemed with coming up with an answer and explanation. Great...
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5teveo
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If every couple who can conceive will conceive, then the probability would be 1/100 * 1/200, or .005%.
But that is only if the vasectomy and ligation are the only factors that would prevent conception.
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You do realize that .005% means 5 in 100000, or 0.00005, don't you? :)
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wrt1mea

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Looked right over the %....crap Dan. I apologize.
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Want me to get a mod to reopen?
Nah, it's OK. I'll be more careful next time to skip the percentages :)