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#1 2007-04-02 10:10:20

Prakash Panneer
Member
Registered: 2006-06-01
Posts: 110

Algebra

John Doe works for a packaging company. One day, he received five different orders and accidentally mixed up the addresses. So he applied address labels randomly on the packages.What is the probability that exactly four packages were correctly labeled?

Thanks in Advance up


Letter, number, arts and science
of living kinds, both are the eyes.

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#2 2007-04-02 10:16:19

JaneFairfax
Member
Registered: 2007-02-23
Posts: 6,868

Re: Algebra

If four packages are correctly labelled, the last label must correctly match the last package. In other words, we want to find the probability that all five packages are correctly labelled, and that’s 1⁄5! = 1⁄120. smile

EDIT: Or do you really mean EXACTLY four packages correctly labelled? That wouldn’t be possible because, as I said, the last label must be the correct one for the last package if the other four were correctly marked. hmm

Last edited by JaneFairfax (2007-04-02 10:20:48)

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