Question:`ab - 3a^2 - 5b^2 - 3ab + 4a^2 + 5b^2`প্রথম ও ‍দ্বিতীয় রাশির যোগফল কত ? 

A `2a^2` 
B `a^2 - 2ab` 
C `3a^2 - 2ab` 
D `a^2 - 3ab` 

+ Answer
B 

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Irin Moni

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