olymmath

AIME 2019a Problem 1

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Consider the integer N=9+99+999+9999+⋯+99…99⏟321 digits.N = 9 + 99 + 999 + 9999 + \cdots + \underbrace{99\ldots 99}_\text{321 digits}.Find the sum of the digits of NN.

Dataset text AIME 1983 to 2026. Quoted with source.

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342

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