Question:`x^2 + y^2 + z^2, x^2 - y^2 + z^2, -x^2 + y^2 - z^2` তিনটি বীজগণিতীয় রাশি। রাশি তিনটির যোগফল কত ? 

A `3x^2 + y^2 + z^2` 
B `2x^2 + y^2 + z^2` 
C `x^2 + y^2 + z^2` 
D `x^2 - y^2 + z^2` 

+ Answer
C 

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Irin Moni

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