What is i hcf of 21 and 28

\( 21|3 \\ 7 \ |7 \\ 1 \\\\ 21=3*7 \\\\ 28|2 \\ 14|2 \\ 7 \ |7 \\ 1 \\\\ 28=2^2*7 \\\\ H. C. F(21;28)\to\boxed{7} \)

The factors of  21  are  1,  3,  7, and  21.

The factors of  28  are  1,  2,  4,  7,  14, and  28.

The factors common to both numbers are  1  and  7.

The greatest one is  7.

Ai făcut o greșeală. 84 is the Least Common Multiple (LCM), not the Highest Common Factor (HCF).


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