Committee Counts
1. **Problem statement:** We need to find the number of possible committees of 5 people chosen from 6 men and 4 women under three different conditions.
2. **(a) Committee with 3 men and 2 women:**
- Number of ways to choose 3 men from 6: $\binom{6}{3}$
- Number of ways to choose 2 women from 4: $\binom{4}{2}$
- Total number of committees: $\binom{6}{3} \times \binom{4}{2}$
- Calculate:
$$\binom{6}{3} = \frac{6!}{3!(6-3)!} = \frac{6 \times 5 \times 4}{3 \times 2 \times 1} = 20$$
$$\binom{4}{2} = \frac{4!}{2!(4-2)!} = \frac{4 \times 3}{2 \times 1} = 6$$
- So, total committees = $20 \times 6 = 120$
3. **(b) Committee composed of men only:**
- Choose 5 men from 6 men: $\binom{6}{5}$
- Calculate:
$$\binom{6}{5} = \frac{6!}{5!(6-5)!} = 6$$
- So, total committees = 6
4. **(c) Committee with a majority of women:**
- Majority means more women than men, so more than 2.5 women, i.e., at least 3 women.
- Possible women counts: 3 women + 2 men, 4 women + 1 man, 5 women + 0 men
- Number of ways:
- 3 women and 2 men: $\binom{4}{3} \times \binom{6}{2}$
- 4 women and 1 man: $\binom{4}{4} \times \binom{6}{1}$
- 5 women and 0 men: $\binom{4}{5} = 0$ (not possible as we only have 4 women)
- Calculate:
$$\binom{4}{3} = 4, \quad \binom{6}{2} = \frac{6 \times 5}{2} = 15$$
$$\binom{4}{4} = 1, \quad \binom{6}{1} = 6$$
- Total committees = $4 \times 15 + 1 \times 6 + 0 = 60 + 6 = 66$
**Final answers:**
- (a) 120
- (b) 6
- (c) 66