Question:নিচের কোনটি সমান্তর ধারা ? 

A a+d+2d+........ 
B a+(a-d)+(a+2d)+....... 
C (a+d)+(2a+d)+(2a+2d)+....... 
D a+(a+d)+(a+2d)+...... 

+ Answer
D 

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sahana pervin

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