(a-1 + b-1 ) ab = ………………… A) ab B) a-b C) \(\frac{1} – InterviewSolution

1.

(a-1 + b-1 ) ab = ………………… A) ab B) a-b C) \(\frac{1}{a+b}\)D) a + b

Answer»

Correct option is (D) a+b

\((a^{-1}+b^{-1})\,ab=(\frac1a+\frac1b)\,ab=(\frac{a+b}{ab})\,ab\) = a+b

Correct option is D) a + b

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