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Let S1, S2, S3 be the respective sums of...

Let `S_1, S_2, S_3` be the respective sums of first `n, 2n and 3n` terms of the same arithmetic progression with `a` as the first term and `d` as the common difference. If `R=S_3 -S_2 -S_1,` then `R` depends on

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