a bag containing 4 red balls and n green balls probability of having green balls is 3 times the red balls and what is value of n
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answer :-
Given, The bag contains 5 red balls and n green balls.
Total no. of balls = (5+n)
The probability of having a red ball is
5/(5+n)
The probability of having a green ball is
n/(5+n)
According to the question,
3×5/(5+n) = n/(5+n)
Dividing by (5+n) on both sides
3×5 = n
n = 15.
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