Question

A has 3 maps and b has 9 maps. determine the number of ways in which they can exchange their

Answer 1

3=9
4=8
5=7
6=6shold be the answer

Answer 2

Answer:- 219

A has 3 maps. So the number of ways in which A can exchange map will be:-

Case 1 -> Exchange 1 map = 3C1 (Ways for A) x 9C1 (Ways for B) = 27

Case 2 -> Exchange 2 maps = 3C2 (Ways for A) x 9C2 (Ways for B) = 108

Case 3 -> Exchange 3 maps = 3C3 (Ways for A) x 9C3 (Ways for B) = 84

So Total Number of Ways will be = Case 1 + Case 2 + Case 3 = 27 + 108 + 84 = 219