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work out the HCF of 42 and 63

Sagot :

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[tex]42=2 \times \textcircled{3} \times \textcircled{7} \\ 63=\textcircled{3} \times 3 \times \textcircled{7} \\ \\ HCF(42,63)=3 \times 7=21[/tex]
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