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The only numbers that can be made with ONLY 5 and 6 are 56 and 65. That is because 5 and 6 are only 2 numbers. If you wanted a three digit number, you would have to use double of one number. You could say these numbers:

556 566 565 656 665 Other than that, I do not know.

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Q: How many three digits numbers contain only 5 and 6?
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