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

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

Algebra.Com

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