Math miscellaneousHard
Question
A bag contains 3 red, 2 green and 2 white balls. Two balls are drawn at random and none of them is found to be a green ball, then the chance that both are red is equal to -
Options
A.1/10
B.2/10
C.3/10
D.4/10
Solution
E : none of the drawn balls are green
E1 : 2R balls are drawn
E2 : 2W balls are drawn
E3 : 1R + 1W balls are drawn
P(E1/E)
E1 : 2R balls are drawn
E2 : 2W balls are drawn
E3 : 1R + 1W balls are drawn
P(E1/E)
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