binomial distribution

Question

Find the probability of exactly three successes in six trials of a binomial experiment in which the probability of success is 50% Round to the nearest tenth of a percent

Answer 1

(6 choose 3) (0.5)^3 (1 - 0.5)^3 =

6*5*4/ (3*2*1) (0.5)^6 =

20 * 0.5^6 = 0.3125