A box contains 24 identical balls of whi...

A box contains 24 identical balls of which 12 are white and 12 are 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 4th time on the 7th draw is (a) `5/64` (b) `27/32` (c) `5/32` (d) `1/2`

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