In a certain class of 30 primary school children there are 16 girls. There are 7 girls and 6 boys with fair hair. A pupil is selected at random to be a class captain. Find the probability that the class captain is
a) a girl whose hair is not fair
b) a boy with fair hair
c) has not ogt fair hair
d) is a girland has not fair hair
I'm not sure how to solve this because it seems as though the tree diagram and the venn diagram are not applicable?