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Write 100 and 120 in their prime compositions in power form:

100 = 223052

120 = 233151

For hcf, take lowest power of each prime across the compositions; for LCM, take highest powers:

hcf = 223051 = 4 x 1 x 5 = 20

LCM = 233152 = 8 x 3 x 25 = 600

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13y ago

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