Find the sum of the digits in the answer to underbrace9999cdots 99_94text nines × underbrace4444cdots 44_94text fours where a string of 94 nines is multiplied by a string of 94 fours.

AMC 8 1994 Problem 25

AMC8 1994 年第 25 题

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Find the sum of the digits in the answer to

\underbrace{9999\cdots 99}_{94\text nines} \times \underbrace{4444\cdots 44}_{94\text fours}

where a string of 94 nines is multiplied by a string of 94 fours.

求以下乘积的各位数字之和： \underbrace{9999\cdots 99}_{94\text{ 个 9}} \times \underbrace{4444\cdots 44}_{94\text{ 个 4}} 即 94 个 9 组成的数乘以 94 个 4 组成的数。

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