A basket contains 4 red balls and 6 black balls, if two balls are selected one after the other without replacement what is the probability that all balls are black?

Respuesta :

4 red, and 6 black.....total of 10

P(black) = 6/10 reduces to 3/5
without replacement
P(black) = 5/9

P(both) = 3/5 * 5/9 = 15/45 reduces to 1/3 <==