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A bag contains a white and b black balls...

A bag contains `a` white and `b` black balls. Two players, `Aa n dB` alternately draw a ball from the bag, replacing the ball each time after the draw till one of them draws a white ball and wins the game. `A` begins the game. If the probability of `A` winning the game is three times that of `B ,` then find the ratio `a : b`

A

`3:4`

B

`4:3`

C

`2:1`

D

`1:2`

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The correct Answer is:
C
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DISHA PUBLICATION-PROBABILITY -2-EXERCISE - 1 : CONCEPT BUILDER
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