[PP Sub Inspector 17 Aug 2021] 

4. If \({x \over y} = {7 \over 8} \), then find the value of \({x^2 + y^2} \over {x^2 - y^2}\)

1. 15

2. 1

3. \(15 \over 113\)

4. \(-113 \over 15\)

Correct Answer :

\(-113 \over 15\)