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Let a_1 , a_2 ,a_3, …., a_n be an A.P. and S_1 , S_2 and S_3 be the sum of first n , 2n and 3n terms respectively then S_3 - S_2 -S_1 is equal to , if a is first term and d is common difference : |
Answer» 3a-2n-d |
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