The 3 digit numbers
How many different 3 digit numbers can you make from the digits 1, 1 and 3. You can use each digit as many times as you like.
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Usually it would be 3!(If you don't understand search up the label 'combinatorics') but you are repeating the 1 so you need to divide it by 2! which is 2. 6/2 = 3
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