Question

A jar contains 7 blue marbles and 2 red marbles. Suppose you choose a marble at​ random, and do not replace it. Then you choose a second marble. Find the probability of the following event. Both of the selected marbles are red.

Answer 1

Explanation:

soo you start with 2 /9 as the possibility of a red marble

but you pick a red one so now there is only 1/8 chance left of a red one

soooo

2/9*1/8 = 3 / 72nds or 1/24 th :/ long odds.... bet a lot, if you get two reds you'll win a million :D