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(a-1 + b-1 ) ab = …………………

 A) ab 

B) a-b 

C) \(\frac{1}{a+b}\)

D) a + b

2 Answers

+1 vote
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Best answer

Correct option is (D) a+b

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

+2 votes
by (38.9k points)

Correct option is  D) a + b

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