24, You can use permutations on a calculator or on paper to solve questions like these.
Ex.
Permutation: 4! = 4 x 3 x 2 x 1 = 24
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16 i think
64
126 combinations. Remember that the order does not matter.
4!=4x3x2x1=24
Two make combinations you would take 2x1=2 combinations only