1.

A bag contains X red balls and 5 green balls. 2 balls are picked up from the bag at random, one after the other, without replacement, the probability of both balls being red is 3/7. What will be the value of X?1). 102). 153). 134). 20

Answer»

Number of GREEN BALLS = 5

Number of Red balls = X

TOTAL number of balls = 5 + X

Probability of both balls being red = 3/7

XC2 / 5 + XC2  = 3/7

Only 10 satisfies the value of X

∴ Number of red balls, X = 10


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