Please help me with this homework problems???? I'm not very good in it but I'm trying to learn its concept

Posted on 2014-03-18 11:12:00 in Engineering by HENRYBLAKE

A group of 12 environmentalists comprising of 7 engineers and 5 biologists are to be selected to form a committee. Find the number of ways of

(a) Forming a committee of 5 members consisting of at least 3 engineers.

(b) Arranging all the 12 environmentalists in a row such that they are always in the group of the same expertise.

(c) Selecting 3 members for the post of chairman, secretary and treasurer.

(d) Forming a committee of 5 members with an engineer as chairman and a biologist as secretary.



Ps:I'm stuck at this question and not very pro in permutation problems, help me!!!

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