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July 23, 2014

Homework Help: maths-probability

Posted by suheil on Tuesday, December 4, 2012 at 11:59pm.

A person writes letter to 6 friends and addresses the corresponding envelopes. In how many ways the letter be placed in envelops so that---
(i) Atleast 2 of them are in wrong envelop
(ii) All the letters are in wrong envelop

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