(6-1 – 8-1)-1 + (2-1– 3-1)-1 = ………………… A) 60 B) 15

1.	(6-1 – 8-1)-1 + (2-1– 3-1)-1 = ………………… A) 60 B) 15 C) 20 D) 6
Answer» Correct option is (B) 30 \((6^{-1}-8^{-1})^{-1}+(2^{-1}-3^{-1})^{-1}\) \(=(\frac16-\frac18)^{-1}+(\frac12-\frac13)^{-1}\) \(=(\frac{4-3}{24})^{-1}+(\frac{3-2}6)^{-1}\) \(=(\frac{1}{24})^{-1}+(\frac{1}6)^{-1}\) \(=(24^{-1})^{-1}+(6^{-1})^{-1}\) = 24+6 = 30 Correct option is B) 15

(6-1 – 8-1)-1 + (2-1– 3-1)-1 = ………………… A) 60 B) 15 C) 20 D) 6

Answer»

Correct option is (B) 30

\((6^{-1}-8^{-1})^{-1}+(2^{-1}-3^{-1})^{-1}\) \(=(\frac16-\frac18)^{-1}+(\frac12-\frac13)^{-1}\)

\(=(\frac{4-3}{24})^{-1}+(\frac{3-2}6)^{-1}\) \(=(\frac{1}{24})^{-1}+(\frac{1}6)^{-1}\)

\(=(24^{-1})^{-1}+(6^{-1})^{-1}\) = 24+6 = 30

Correct option is B) 15