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In an apartment consisting of 108 floors, two lifts A & B starting from the ground floor, stop at every 3rd and 5th floors respectively. On which floors, will both of them stop together?

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LCM of 3 and 5 = 3 × 5 = 15

The lifts stop together at floors 15, 30, 45, 60, 75, 90 and 105.

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