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How many different four-digit numbers can be made using the digits 1, 2, 3, 4, 5, 6 if no digit can be used more than once?

A: 4C2 = 6
B: 6C4 = 15
C: 6P4 = 360
D: 6P4 = 12

Respuesta :

this is 6P4
the number of permutations of 4 from 6.  6! / 2!

= 6*5*4*3* 2 /  2 = 360

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