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If you allow for zeros, that's 10^16, which is ten quintillion, or 10,000,000,000,000,000.

If not, it's 9^16, which is 1,853,020,188,851,841, or 1.85 quintillion. (1.85x10^15)

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Q: How many 16 digit combinations can be created if numbers can be repeated?
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