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Mathematics 13 Online
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?

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

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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