It is 35
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No. The prime factors of 140 are 2,2,5 and 7 The prime factors of 210 are 2,3,5 and 7 The common prime factors are 2,5 and 7 Thus the HCF is 2x5x7, or 70.
The GCF is 30.
3.
The HCF of 30 and 105 is 15.
The GCF is 3.