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A box contains 20 identical balls of whi...

A box contains 20 identical balls of which 5 are white and 15 black. The balls are drawn at random from the box one at a time with replacement. The probability that a white ball is drawn for the 3rd time on the 6th draw is- a.`1/2` b.`135/2048` c.`135/1024` d.`27/4096`

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