Question

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Answer 1

Here ur ans.

1. not red

no of red balls

no.of total balls

x/18

2. now x+2

& no. of total ball is = 2+ 18= 20 now

the proballty is x+2/20

Answer 2

1) Total No . of Obs = 18

No . of Red Balls = x

Probability of Red Ball = Favourable Obs / Total No. of Obs

P(of Red Ball) = x/18

2) Two Red Balls Are Added

So,

No . of Red Balls = x + 2

Total no .of Balls = 18 + 2 = 20

P(of red Ball) = x + 2 / 20

P given 9 times of P obtained in A

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

x / 16 = (x + 2)/20

(x / 16) * 20 = x + 2

5x / 4 = x + 2

5x = 4x + 8

5x - 4x = 8

x = 8

Therefore,

Initial No.Of Red Balls = 8

Hope U Understood

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