Question:`a/(a + b) + (ab)/(a^2 - b^2)`= কত? 

A `(ab)/(a^2 - b^2)` 

B `(a^2b)/(a^2 - b^2)` 

C `(ab^2)/(a^2 - b^2)` 

D `a^2/(a^2 - b^2)` 

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