Question:`x + y = 6 , x^2 - y^2 = 12` হলে-- `i. (x - y)^2 = 4` `ii. x = 4` `iii. xy = 8` নিচের কোনটি সঠিক? 

A i ও ii 

B i ও iii 

C ii ও iii 

D i , ii ও iii 

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