A permutation lock will open if the right choice of 4 numbers (from 1 to 20) is selected. How many lock permutations can be made assuming no number is repeated?
116280
6840
7820
115280
We have 100 digits and arrange four of them. We have options.
=116280
Therefore, the total number of ways lock permutations can be made is 116280 ways.
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