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There are only 4 different prime numbers less than 9 (2, 3, 5 & 7) and no three of them sum to 9, so the same number must be used more than once eg 2, 2, 5 (20) or 3, 3, 3 (27). If you wrongly regard 1 as a prime then 1, 3 and 5 ie 15 would be an answer.

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