यदि a = \(\frac{7}{9}\) है तथा b = \(\frac{5}{13}\) है,  तो  \(\left(a^{-1}+b^{-1}\right) \times(a+b)^{-1}\) का मान कितना है?

1
\(\frac{136}{35}\)
2
\(\frac{35}{117}\)
3
\(\frac{35}{136}\)
4
\(\frac{117}{35}\)

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