Question

Let X represent the difference between the number of heads and the number of tails obtained when a coin is tossed n times. Then the possible values of X are 

(a) i + 2n, i = 0, 1, 2 … n 

(b) 2i – n, i = 0, 1, 2 … n 

(c) n – i, i = 0, 1, 2 … n 

(d) 2i + 2n, i = 0, 1, 2 … n

Answer 1

(b) 2i – n, i = 0, 1, 2 … n