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.

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I think now you can do it – Megh Choksi · 1 year, 9 months ago

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– Omkar Kulkarni · 1 year, 9 months ago

Oh now it makes sense. Thanks!Log in to reply