The GCF is 1.
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If you mean: 21, 49 and 84 then the HCF is 7
HCF is the highest common factor of two or more numbers. HCF of 56 and 49 is 7.
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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
The HCF of the three numbers is 100