Assuming a number can appear only once, there are
47C5 = 47*46*45*44*43/(5*4*3*2*1) = 1,533,939 combinations.
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You can make 5 combinations of 1 number, 10 combinations of 2 numbers, 10 combinations of 3 numbers, 5 combinations of 4 numbers, and 1 combinations of 5 number. 31 in all.
120 5x4x3x2x1=120
Only one.
There are 7C4 = 7!/(4!*3!) = 7*6*5/(3*2*1) = 35 combinations.
There are 11,238,513 of them.