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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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