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42 = 21 x 31 x 71

126 = 21 x 32 x 71

210 = 21 x 31 x 51 x 71

Take the lowest power of the common primes:

hcf of 42, 126 & 210 is 21 x 31 x 71 = 42.

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Q: What is the highest common factor of 42 126 and 210?
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