An experiment consists of drawing one ball from a box containing 5 white balls numbered 1 through 5 and black balls numbered 6 through 10. Find the probability that a randomly selected ball is black and numbered 7.

Answer 1

1/10 # 7
5/10 black balls
1/10 + 5/10 = 3/5
Is my answer correct? Thanks!

Answer 2

you want your ball to be #7 AND black
There is only one such ball

prob (black and #7 ) = 1/10