A bag has 13 red, 14 green and 15 black ...

A bag has 13 red, 14 green and 15 black balls, The probability of getting exactly 2 black on pulling out 4 balls is `P_(1)`. Now the number of each colour ball is doubled and 8 balls are pulled out. The probability of getting exactly 4 blacks is `P_(2)` then.

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