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Detailed solution please?

This question came in a test I had today, which pretty much left me stumped. I mean, I wrote something, but I wasn't sure what I was writing. Anyway. Find the number of ten digit numbers with at least two digits equal.

Note by Omkar Kulkarni
2 years, 4 months ago

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total - ( no digit equal + 1 digit equal)

I think now you can do it Megh Choksi · 2 years, 4 months ago

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@Megh Choksi Oh now it makes sense. Thanks! Omkar Kulkarni · 2 years, 4 months ago

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