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UPSC 2013 CDS 2 Math Paper

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Question : 24

Total: 100

For integers a, b and c, if HCF (a, b) = 1 and HCF (a, c) = 1, then which one of the following is correct?

HCF(a, bc) = 1
HCF(a, bc) = a
HCF(a, bc) = b
None of the above

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