ProbabilityHard

Question

A bag contains 2 white & 4 black balls. A ball is drawn 5 times, each being replaced before another is drawn. The probability that atleast 4 of the balls drawn are white is:

Options

A.4/81
B.10/243
C.11/243
D.none

Solution

2W & 4B
P = 5C4 ×

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