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OpenStudy (anonymous):
A school is running a raffle. There are 100 tickets, of which 3 are winners. You can assume that tickets are sold by drawing at random without replacement from the available tickets. Teacher X buys 10 raffle tickets, and so does Teacher Y. Find the chance that one of those two teachers gets all three winning tickets.
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OpenStudy (perl):
hello
OpenStudy (anonymous):
hello
OpenStudy (perl):
P( X gets 3 or Y gets 3 ) = P( X gets 3 ) + P(Y gets 3 ) - P( X gets 3 & Y gets 3) now they cant both get 3 so thats mutually exclusive
OpenStudy (perl):
|dw:1366646544655:dw|
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