1 Answer

Harishtps · Answer 1 · 2016-03-13T16:05:36+0000

The probability of picking a black ball first is
(4)/(5)

, because there are 4 black balls and 1 white ball which is 5 balls in total. After picking the first ball, 4 balls remain - 3 black and 1 white, so the probability of picking a white ball is
(1)/(4)

.
So, the probability of picking a black ball first followed by a white ball is
$(4)/(5)\cdot(1)/(4)=(1)/(5)$

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