MCQ
Mark $(\checkmark)$ tick against the correct answer in the following:
$(6^{-1}-8^{-1})^{-1}=?$
$(6^{-1}-8^{-1})^{-1}=?$
- A$-\frac{1}{2}$
- B$-2$
- C$\frac{1}{24}$
- ✓$24$
✓
Answer
Correct option: D.
$24$
$\because (6^{-1}-8^{-1})=\Big(\frac{1}{6}+-\frac{1}{8}\Big)^{-1}$
$=\Big(\frac{4-3}{24}\Big)^{-1}$
$=\Big(\frac{1}{24}\Big)^{-1}=24$
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