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April 25, 2015

Homework Help: Maths

Posted by Claire on Wednesday, October 8, 2008 at 12:40pm.

These questions are about permutations and combination:

Find the number of ways in which a class of 20 children can be divided into two groups of 6 and 14 if the class has a set of twins who are inseperable. (ans. is 21624)

Four books are taken from a shelf of 18 of which 6 are paperback and 12 are hardback. In how many ways can 4 books be chosen if at least one of them is paperback? (ans, is 2565)

Can somebody help me to work these questions out?

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