Quantitative Aptitude Algebra Identities

Let a + b = 1, then the value of (\(\frac{1}{a^2} + \frac{1}{b^2} + \frac{2}{ab}\)) is:

1
\(\dfrac{1}{a^2 b^2}\)
2
\(\dfrac{1}{ab}\)
3
\(\dfrac{1}{a^2 b}\)
4
\(\dfrac{1}{ab^2}\)

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