What is the number of different committees of 4 people that can be selected from a group of 10 people?
a) 20
b) 40
c) 80
d) 120
e) 210
vikram4689 Wrote:This is a direct question of Combinatons.
C (n,r) = n ! / [ r ! * (n! - r !) ]
n = total no of entities = 10 (here)
r = no of entities to be selected = 4 (here)
solve by substituting the values. Answer is 210, e)