Asalesman has a 20% chance of a sale at his first stop, a 30% chance of a sale at his second stop and a 16% chance of a sale at both stops. find the odds that
(a) he will make a sale at both stops. reduced to lowest terms, odds are
to
.

(b) he will make a sale only at the first stop. reduced to lowest terms, odds are
to
.

(c) he will make a sale at the second stop. reduced to lowest terms, odds are
to
.