Math
posted by Jane .
Laurie is holding 6 red cards and 7 black cards. If two cards are selected at random(w/out replacement), what is the probability that the first card selected is red and the second is black?

The probability of a favourable first draw is 6 cards out of 13.
The probability of a favourable second draw, given the first one has succeded, is 5 cards out of 12.
The probability of both happening will therefore be the product of the two.