a) The access code for a security system consists of five positions. The first position can be any letter 26, while each next position can be a digit from 0 through 9. How many access codes are possible if each digit can be used only once and not repeated, and the first digit must be a four or higher? ( show work)
b) An amateur golfer has 4 nike golf balls, 3 callaway balls, 6 Tritliest balls in his bag befor he stars his round. On the first hole he randomly selects a ball from his bag and hits the ball into a water hazard. As a result, he selects another random ball from his bag and hits a drive into the middle of the fairway. What is the probability that he randomly selected 2 Nike balls to start his round?