THIS MONTH'S QUIZ
There are seven ways of dividing four people, A, B, C and D,
into two (nonempty) groups, namely:
1. (A) (BCD)
2. (B) (ACD)
3. (C) (ABD)
4. (D) (ABC)
5. (AB) (CD)
6. (AC) (BD)
7. (AD) (BC)
1. In how many ways can five people be divided into two groups?
2. In how many ways can ten people be divided into two groups?
3. In how many ways can ten people be divided into three groups?
