In a pack of 52 cards there are four equal suits, two of black and two of red. If we remove two random cards, what is the probability that the two cards are of the same colour?
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Sample space= C 2 5 2
S=1326
Let A be the event of two cards of same colours
A= 2 × ( C 2 2 6 )
Probability P(A)=0.49