Question:(a - b + c) এর বর্গ নিচের কোনটি? 

A `a^2 + b^2 + c^2 - 2ab - 2bc + 2ca` 
B `a^2 + b^2 + c^2 - 2ab + 2bc - 2ca` 
C `a^2 + b^2 + c^2 + 2ab - 2bc - 2ca` 
D `a^2 + b^2 + c^2 - 2ab - 2bc - 2ca` 

+ Answer
A 

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Irin Moni

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