Question

Four red, 8 blue, and 5 green balls are randomly arranged in a line. (a) what is the probability that the first 5 balls are blue? (b) what is the probability that none of the first 5 balls are blue? (c) what is the probability that the final 3 balls are differently colored. (d) what is the probability that all the red balls are together?

Answer 1

a
$\frac{5}{17}$
is the answer