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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 |
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Answer» 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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