In the casino game roulette a wheel is spun and a ball randomly falls on one of 38 numbers. The numbers are either red, black, or green. There are 18 red numbers, 18 black numbers, and 2 green numbers. Again, this makes 38 numbers in total.

a) what is the probability that when spinning a roulette wheel one time, the ball lands on a red number?

b) when spinning the wheel twice (two independent spins) what is the probability it lands on two red numbers in a row?

c) when spinning the wheel twice (two independent spins), what is the probability it lands on a red number on either the first or the second spin?