Basic Maths Grand Test- Q10

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Three squares of chess board are selected at random. The probability of getting 2 squares of one colour and other of a different colour is

A. 16/21

B. 8/21

C. 3/32

D. 3/8

asked Nov 17 in Basic Maths by gbmentor (85,520 points)
reshown Nov 20 by getgatebook

1 Answer

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ANS A.

Total boxes in chess of 8*8= 64.

choosing any 3 squares= 64C3.

Choosing such that we have 2 of one colour and 1 of other colour. 

So,   2B and 1W or 1W or 2B.  (2 possibilities).

Required probability=  (32C2 * 32C1) * 2  / 64C3= 16/21

answered Nov 20 by bhargavakapilpro20 (13,760 points)
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