Suppose a jar contains 20 red marbles and 36 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.
number of red marbles = 20
number of blue marbles = 36
total number of marbles = (20+36) = 56
If you reach in the jar and pull out 2 marbles at random at the same time, find the probability that both are red be:-
***another approach:-
probability that the first marble pulled is red = 20 / 56
probability that the second marble pulled is red = 20-1 / 56-1 = 19/55
the probability that both are red be:-
= (20/56)* (19/55)
= 19/154.
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