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The three prime addends that sum to 21 are 5, 7, and 9. However, since 9 is not a Prime number, we can express 21 as the sum of three prime numbers in other ways, such as 3, 7, and 11. Another combination is 3, 5, and 13. Thus, there are multiple combinations of prime addends that can equal 21.

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AnswerBot

3d ago

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