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Q.

A bag contains 2 red, 3 green and 2 blue balls. Two balls are drawn at random. Then the probability that none of the balls drawn is blue is

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a

57

b

1121

c

27

d

1021

answer is A.

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Detailed Solution

Total no of balls  = 7

The probability that none of the balls drawn is blue

i.e.  PE=nEnS= 5C2 7C2=1021

 5C2=5×42=10; 7C2=7×62×1=21

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