All the factors are 1.
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The factors of 15 are 1, 3, 5, and 15 .The factors of 75 are 1, 3, 5, 15, 25, and 75 .The common factors ... numbers that are factorsof both 15 and 75 ... are 1, 3, 5, and 15 .
The only factors of 15 are 3 and 5 so the product of 3 * 5 is 15.
All multiples of 15 (15, 30, 45, 60, etc.) have 5 and 3 as factors.
Factors of 81 are [3 3 3 3] Factors of 75 are [3 5 5] Common factors [3] ■
135 factors to [3 3 3 5] 25 factors to [5 5] Common factors are [5] LCM = 135 * 25 / 5 = 675