1.

A bag contains 8 red and 5 white balls. Two successive drawings of 3 balls are made such that (i) balls are replaced before the second draw, (ii) the balls are not replaced before the second draw. Find the probability that the first drawing will give 3 white and second 3 red balls.

Answer»


Answer :(i)`P(ACAPB) = 5/143 XX 28/143 = 140/20449`
(II)` therefore P(Ccap D ) = 5/143 xx 7/15 = 35 /2145 = 7 /429`


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