How many 6 digit numbers can be formed with 6 digits?

Answer 1

If the digits may not be repeated, there are 6x5x4x3x2x1 = 720 numbers,

If digits can be repeated, the answer is 6x6x6x6x6x6 = 46,656 numbers

If zero is ong the available digits but is excluded from the first place. 5x6x6x6x6x6=38,880 numbers

Answer 2

There are 729 unique possibilities. This is 3 to the power 6. For each of the positions in the 6 digit result, the selected digit will be one of the three possibilities.