Each students in Ms. Wangs class will use a keyboard with 5 buttons on it to enter a 3-digit nunber. Each button has a different digit on it, from 1 through 5. (Some possible numbers are 111, 123, and 552.) How many different 3-digit numbers are possible for a student to enter?

If eh = hg and hg=16, find the diameter of k

Hi, can anyone show me how to do this problem? 100 points for this. in advance

Aroulette wheel has 38 slots in which the ball can land. two of the slots are green, 18 are red, and 18 are black. the ball is equally likely to land in any slot. the roulette wheel is going to be spun twice, and the outcomes of the two spins are independent. the probability that it lands one time on red and another time on black in any order is(a) 0.5 (b) 0.25 (c) 0.4488 (d) 0.2244