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Required probability= P(Box A is selected, 1 gum, 1 candy) +P(Box B is selected, 1 gum, 1 candy)
= (1/2)*( 6 C 1 )( 4 C 1 )/( 10 C 2 ) + (1/2)*( 3 C 1 )( 7 C 1 )/( 10 C 2 ) = 1/2
A bag contains 3 Green and 9 Red balls. One ball is drawn at random. What is the probability that the ball drawn is Red?
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