Question

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Answer 1

THEREFORE the value of x is 8

Answer 2

i) Total no. of balls = 18

no, of red balls = x

hence, P(Red) = x/18

           P(not Red) = 1-x/18 = (18-x)/18

ii) If 2 more red balls are put,

Then Total No. of balls = 20

    no. of red balls = (x+2)

Hence, P'(Red) = (x+2)/20

But , P'(Red) = 9*P(Red)/8

Hence, (x+2)/20 = 9*x/8*18

       hence, x = 8