Answer: Option E.
Step-by-step explanation:
The total number of committees possible if no conditions persists is=
⁸C₄ x ⁷C₅= 70 x 21= 1470
Now, 3 men refuse to serve together
So, combination possible for the scenario when they serve together is= ⁵C₄ x ⁷C₅= 5 x 21= 105
So, combination possible for the scenario when they don't servce together is= 1470- 105= 1365