Suppose a jar contains 8 red marbles and 38 blue marbles. If you reach in the jar and pull out 2 marbles at random at the same time, find the probability that both are red.

Answer 1

8 red and 38 blue
total marbles = 8 + 38 = 46 marbles

8 out of 46 marbles are red, and you want to find out what the probability is that that 2 marbles you pull randomly are both red.

8/46 - red marbles/total marbles
2/46 - 2 red marbles/total marbles

simplify 2/46 to 1/23
1/23 is the final answer

Answer 2

Probab = (8/46)(7/45) = 28/1035