Discussion Forum



1)

Six identical coins are arranged in a row. The number of ways in which the number of tails is equal to the number of heads is


A) 20

B) 9

C) 120

D) 40

Answer:

Option A

Explanation:

Required number of ways

= $\frac{6!}{3!3!}$ = $\frac{720}{6\times6}$

= 20