6.4.4

Five numbers are chosen at random from the whole numbers between 1 and
13 inclusive, with replacement.

(a) What is the probability that all the numbers are even?

(b) What is the probability that all the numbers are odd?

(c) What is the probability that at least one of the numbers is odd?

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Exercise 11-14 (13 is assigned) refer to a classroom of children 
(12 boys and 10 girls) in which 7 students are chosen at random to go to
the blackboard.

11. What is the probability that at least two girls are chosen?

12. What is the probability that no girls are chosen?