SOLUTION: You find a locked treasure box. There are 40 numbers on the dial 0-39 You also find a clue that says that the combination that opens the lock contains repeats in the 3 number combi

Question 1075841: You find a locked treasure box. There are 40 numbers on the dial 0-39 You also find a clue that says that the combination that opens the lock contains repeats in the 3 number combinations
How many of the total possible three digit combinations include repeats?
Answer by rothauserc(4718) (Show Source): You can put this solution on YOUR website!
With repeats there are 40 * 40 * 40 = 64000 combinations
Without repeats there are 40 * 39 * 38 = 59280
:
There are 64000 - 59280 = 4720 combinations that include repeats
:

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