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OpenStudy (anonymous):
Four trumpet players’ instruments are mixed up, and the trumpets are given to the players just before a concert. What is the probability that no one gets his or her trumpet back?
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OpenStudy (ragingsquirrel):
75%?
OpenStudy (pokemon23):
1/4?
OpenStudy (anonymous):
No. The probability that they get theirs is 1/4th = 25%. The probability that they won't get their's is 75%. The probability that none of them get theirs is 0.75*0.75*0.75*0.75.
OpenStudy (ragingsquirrel):
So i was right.
OpenStudy (anonymous):
.316
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OpenStudy (anonymous):
You were right for one of them not getting their instrument. Not all of them not getting their instrument.
OpenStudy (ragingsquirrel):
Grr... you're just too good
OpenStudy (pokemon23):
he deserves a medal
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