Probability Practice Test 1

Question : 8 of 40

Marks: +1, -0

A box containing 6 red, 7 black and certain number of green balls. If the probability of getting a red balls is

1 /4

, then the number of green balls in the box are:

Solution:

Let the total number of balls = xProbability of getting a red ball

=6/x

⇒1/4=6/x

⇒ x = 24
So, green balls = 24 - 6 - 7 = 11

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