Q.

Three squares of a chess board are chosen at random, the probability that two are of one color and one of another is

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a

1621

b

821

c

3212

d

1627

answer is A.

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Detailed Solution

P(E)=2×C2   32×C1   31C3   64=1621
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Three squares of a chess board are chosen at random, the probability that two are of one color and one of another is