A bag contains 5 red balls and 'n' green balls. If the P(green ball) = 3 X P(red ball), then what is the value of n?

Dear Student,

Please find below the solution to the asked query:

Given : A bag contains 5 red balls and ' n ' green balls.

We know Probability P ( E ) = Total number of desired events n ( E)Total number of  events n ( S)

So,
Total number of events n ( S ) = Total number of balls  =  5 + n 

Then

Probability of getting a red ball =  P ( Red ball ) = 55 +n

And

Probability of getting a green ball =  P ( Green ball ) = n5 +n

Given  : P ( Green ball ) =  3 × P ( Red ball )

n5 +n = 3 × 55 +n

n  =  15                                                                                  ( Ans )

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