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Find the sum of the series 2 + 5 + 14 +4...

Find the sum of the series `2 + 5 + 14 +41 + 122` +.... up to `n` terms and hence evaluate `S_a.`

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Find the sum to n terms of the series: 5+11+19+29+41.....

Find the sum to n terms of the series 5+ 11 + 19 + 29+ 41+ ……