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if S1 s2 s3 .......sp be the sums of n terms of A.P. whose first terms are 1 2 3.....p and whose common difference are 1 3 5.......2p-1 shows1+s2+.......+sp=np÷2 (np+1)

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  • if S1 s2 s3 .......sp be the sums of n terms of A.P. whose first terms are 1 2 3.....p and whose common difference are 1 3 5.......2p-1 shows1+s2+.......+sp=np÷2 (np+1)


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