Question 641738
There are 2^4 or 16 outcomes of boys and girls, all the way from 4 girls to 4 boys.
a) P(only 1 boy) = 4/16 or 1/4
b) P(2 or 3 boys) = 6/16 + 4/16 = 10/16 = 5/8
c) P(all girls) = 1/16
d) P(at least 1 boy) = 15/16