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The sum of the series 1+4+3+6+5+8+ upto ...

The sum of the series `1+4+3+6+5+8+` upto `n` term when `n` is an even number `(n^2+n)/4` 2. `(n^2+3n)/2` 3. `(n^2+1)/4` 4. `(n(n-1))/4` `(n^2+3n)/4`

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