The least common multiple of two coprime numbers is 315

315=3×3×5×7
Coprime numbers have no common factor except 1, so both numbers can't be multiples of 3, they can only be
(1) 5 and 3 × 3 × 7 = 63
(2) 7 and 3 × 3 × 5 = 45
(3) 3 × 3 = 9 and 5 × 7 = 35

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