if Sr denotes the sum of first r terms of an A.P.,then find S3r-Sr-1/S2r-S2r-1
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if Sr denotes the sum of first r terms of an A.P.,then find S3r-Sr-1/S2r-S2r-1
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Verified answer
Let a is the first term and d is the common difference of AP∵ Sn = n/2{2a + (n - 1)d}
and
so,
And
Hence,
= (2r + 1)