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Best Answer
15 = 3 x 5
21 = 3 x 7
27 = 3 x 3 x 3
hcf of 15 and 21 is 3
lcm of 15 and 21 = 15 x 21 / 3 = 105
hcf of 105 and 27 = 3
lcm of 105 and 27 = 105 x 27 / 3 = 945
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