A committee of 5 people is to be chosen from a group of 12 people 6 women and 6 men. In how many ways can the committee be chosen so as to include exactly 3 men
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Such a committee can have 2 men+2 women, 3 men+1 women or 4 men+0 women. The number of ways of achieving these outcomes are:
Ways for 2 men+2 women combinations = [6!/(4!)(2!)]*[5!/(3!)(2!)] = 150.
Ways for 3 men+1 women combinations = [6!/(3!)(3!)]*[5!/(4!)(1!)] = 100.
Ways for 4 men+0 women combinations = [6!/(2!)(4!)]*[5!/(5!)(0)] = 15.
Total of ways as requested = 150+100+15 = 265.
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