Question

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

Answer 1

Answer:

15

Step-by-step explanation:

Total no. of balls = 5+n

P ( green balls)= n/5+n        .....1.

p (red balls) = 5/5+n            .....2.

Also given

P (green balls) = 3*P (red balls)        .....3.

From equation 1. ,2. and 3.

n = 15

Answer 2

Answer:

The value of n is 15

Step-by-step explanation:

Since bag  contains 5 red balls and n green balls.

Total balls = 5 + n

Probability(green ball) = (number of green balls / total number of balls)

P(green) = n/(5+n)

P(red ball) =  (number of red balls / total number of balls)

P(red) = 5/(5+n)

Now see, P(green ball)=3 x P(red ball)  Given

Putting values in the given relation,

we get,

n/(5+n) =  3 x  5/(5+n)

n(5+n) = 15(5+n)

So, n = 15

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