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If `a=sqrt8-sqrt7` and `a=1/b`, then `(a^2+b^2-3ab)/(a^2+ab+b^2)` is equal to
यदि `a=sqrt8-sqrt7` और `a=1/b` है, तो `(a^2+b^2-3ab)/(a^2+ab+b^2)` का मान क्या होगा ?

A

`27/31`

B

`27/32`

C

`29/33`

D

`29/31`

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