MCQ
To get the product $1,$ we should multiply $\frac{8}{21}$ by:
- A$\frac{8}{21}$
- B$\frac{-8}{21}$
- ✓$\frac{21}{8}$
- D$\frac{-21}{8}$
Let we should multiply $\frac{8}{21}$ by $x.$
Then according to question, $\text{x}\times\frac{8}{21}=1$
Hence, we should multiply $\frac{8}{21}$ by $\frac{21}{8},$ for getting the product $1.$
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