Question
A bag contains ‘x’ red balls and 2 green balls. If
the probability of getting a red ball is 7/9, then find the probability of getting different coloured balls when two balls are drawn randomly from the bag.Solution
x/(x + 2) = 7/9
→ 9x = 7x + 14 → x = 7
Total balls = 9
P = (7C1 × 2C1)/(9C2) = (7×2)/36 = 14/36 = 7/18
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