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36
Assuming the 36 numbers are all different, there are 36*35/2 = 630 pairs.
36 P 5. n P r This is a permutation so it's 35+35+34+33+32
There are usually 36 number cards although in some decks there are 32 (the 10s are Ts).
Well honey, if you can repeat the numbers, you've got yourself a good ol' case of permutations. With 36 numbers to choose from, you can make a whopping 36^36 combinations. That's a whole lot of number shuffling, so buckle up and start crunching those digits!