Q.

If two squares of unit size are chosen at random on a chess board the probability that they are of the same colour is

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a

3163

b

1621

c

121

d

164

answer is A.

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Detailed Solution

n(S)=C2   64                              n(A)=C2   32+C2   32P(A)=2.C2   32C2   64=3163
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