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Find sum to n terms of the series 1+(2+3...

Find sum to n terms of the series `1+(2+3)+(4+5+6)+"...."`.

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Find the sum of n terms of the series 1. 2. 3+2. 3. 4+3. 4. 5+

Find the sum of n terms of the series 1. 2. 3+2. 3. 4+3. 4. 5+