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OpenStudy (anonymous):
There are 3 black and 7 white balls in the box, identical in touch. You draw 3 balls randomly. If you find 1 black ball among the drawn ones, you will win $1, if you find 2 black balls, you win $2 and you will win $10, if all 3 are black. What are the chances to win at least 1 buck?
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OpenStudy (zarkon):
what have you tried?
OpenStudy (anonymous):
no idea!!
OpenStudy (zarkon):
looks like you get at least $1 if you pick any blacks so either find the prob you get at least one black or 1-P(get no blacks)
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