1.

The H.C.F. of $$\frac{{9}}{{10}},$$ $$\frac{{12}}{{25}},$$ $$\frac{{18}}{{35}}$$ and $$\frac{{21}}{{40}}$$ is:

A. $\frac{{3}}{{5}}$$
B. $\frac{{252}}{{5}}$$
C. $\frac{{3}}{{1400}}$$
D. $\frac{{63}}{{700}}$$
Answer» D. $\frac{{63}}{{700}}$$


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