Question:`a/b = c/d` হলে-- i. 1 - a/b = 1 - c/d` ii. `(a - 1)/b = (c - 1)/d` iii. a + b : c + d = b : d নিচের কোনটি সঠিক? 

A i ও ii 

B i ও iii 

C ii ও iii 

D i, ii ও iii 

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