A study published in a consumer magazine indicated that when a husband and a wife shop for a car, the husband exerts the primary influence in the descision 70% of the time. Five couples who will be purchasing a car are selected at random. Determine the probability of:

a) In exactly two of the couples, the husband will exert the primary influence on the decision.

b) In all five couples, the husband will exert the primary influence on the decision.

I got for a).132 and for b).168 ...is this correct? I dont have an answer key to check.