A box contains 3 red, 3 white and 3 green balls, A ball is selected at random. Find the probability that ball picked up is a red ball.


Solution:
Sample Space = {}
n(S) = 9

Let A = Event of getting a red ball.

A = {}

∴ n(A) = 3

P(A)
=
n(A)
=
3
=
1



n(S)

9

3



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