Who know it?!?!?!?! (Part 32)

Math Olympiad
#1

Point=5000

⚡QUESTION⚡

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#2

The answer is
a×(10^n-1)/9

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#3

10ⁿ-1 or 10^n-1 ? Which you wanted to say ?

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#4

You got 5000 points and-

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