A.
Total # of people = 4+5+6+3 = 18
Now from 18 people, we need to select 5 people for committee.
This can be done in C(18, 5) ways = 8568
So total number of ways of forming committee = 8568
B.
First let's select 2 faculty from a group of 4. This can be done in C(4, 2) = 6
Now we are left with 16 people and we need to select 3 from it. This can be done in C(16, 3) ways = 560
So total different committee possible = 6*560 = 3360
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