Suppose that two cards are selected at random from standard 52 card deck. What is the probability that both cards are less than 10 and neither of them is red?
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E = 10 cards in Black (Exclude red cards)
n(E) = 2 × 10 = 20 in Total (2 Shapes)
n(S) = 52C2 = 52×51/2
p(E) = n(E)/ n(S) = (20 × 2)/(52×51) = 1/( 13×51) = 1/663
n(E) = 2 × 10 = 20 in Total (2 Shapes)
n(S) = 52C2 = 52×51/2
p(E) = n(E)/ n(S) = (20 × 2)/(52×51) = 1/( 13×51) = 1/663
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