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S12 = S8+S4 Prove that.

Answer» 12/2(2a+11d)=8/4(2a+7d)+4/2(2a+3d)=> 6(2a+11d)=4(2a+7d)+2(2a+3d)=> 12a+66d=8a+28d+4a+6d=>12a+66d=12a+34d.S12≠S8+S4


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