Question

We wish to select 6 persons from 8, but if the person a is chosen, then b must be chosen too. In how many ways can the selection be made?

Answer 1

case 1 : A and B is not included

then number of ways = 6C6 = 1

case 2 : B is selected A is not selected

number of ways = 1* 6C5 = 6

case 3: A and B both are selected

number of ways = 1*1* 6C4 = 15

so total ways = 1+6+15 =22

Answer 2

Answer:

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