Can anybody help me on this problem for my Algebra 2 class, I am having a hard time tyring to solve it step by step.

The probability that an archer hits the target is
p = 0.8, so the probability that he misses the target is q = 0.2. It is known that in this situation the probability that the archer hits the target exactly r times in n attempts is given by the term containing pr in the binomial expansion of (p + q)^n.
Find the probability that the archer hits the target exactly four times in six attempts