SOLUTION: How many two-card pairs(i.e., same rank) are there in a standard deck?

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Question 475197: How many two-card pairs(i.e., same rank) are there in a standard deck?
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
4C2=4x3x2!/2x2!=6
13 ranks x 6=78..