Math Problems #5 - Showing that a number is divisible by 9 if and only if the sum of its digits is.

Описание к видео Math Problems #5 - Showing that a number is divisible by 9 if and only if the sum of its digits is.

In this video, we use a direct proof to show that a number is divisible by 9 if and only if the sum of its digits is.

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