In how many ways a number can be formed using all digit 1to 8

please mention number of digits, as there can be 2-digit, 3-digit, etc.. type of numbers can be formed.

For e.g., using all digits, if I want to form 8-digit numbers, then total ways = 8*7*6*5*4*3*2*1 = 8!= 40320 is the answer.

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