Write the first two common multiples of: 15 and 40
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The multiples of 15 are … , 105, 120, 135, …. The multiples of 40 are …, 80, 120, 160, … The common multiples of 15 and 40 are n x 120, intersecting the two sets above, n ≠ 0 ∈ Z n\neq 0 \thinspace\in\thinspace\mathbb{Z} n=0∈Z.
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120,240are common multiple of 15 and 40
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