Probability Question regarding a coin toss

Question

What is the probability that in 7 coin tosses we get exactly 5 heads and 2 tails? Do NOT round.

Answer 1

Pr(5H2T out of 7)

= 7C5(1/2)^7

= 7!/5!2!(1/2^7)

= 21/128

= about 16% for exactly 5 heads in 7 tosses

or more precisely 16.40625 %