2520.
120 = 23 x 3 x 5
1260 = 22 x 32 x 5 x 7
lcm = 23 x 32 x 5 x 7 = 2520
Solution 2:
Prime Factorization of:
120 = 2 * 2 * 2 * 3 * 5
1260=2 * 2 .....* 3 * 5 * 3 * 7
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LCM =2 * 2 * 2 * 3 * 5 * 3 * 7 = 2520
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