Looks extremely tough but is indeed very easy!

Find the smallest positive integer which

when divided by 2 gives remainder 1,
when divided by 3 gives remainder 2,
when divided by 4 gives remainder 3,
when divided by 5 gives remainder 4,
when divided by 6 gives remainder 5,
when divided by 7 gives remainder 6,
when divided by 8 gives remainder 7,
when divided by 9 gives remainder 8,
when divided by 10 gives remainder 9.

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