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

A i ও ii 

B i ও iii 

C ii ও iii 

D i, ii ও iii 

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