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One ball is drawn from a box containing 3 red, 2 blue and x green balls. Find the value of x so that the probability of drawing a green ball is double that of red or blue ball.

 Feb 7, 2022
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red or a blue =   5 out of  (5+x)

 

green =    x out of (5+x)

 

2 * 5/(5+x) = x / (5+x)

 

10 = x               

 Feb 7, 2022

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