What is Arithmetic Series?sum of the terms of a sequence

S_{n} sum of the terms of an arithmetic sequence with n terms.

S_{n} = a_{1 }+ a_{2} + a_{3} + a_{4} … + a_{n}

S_{n} =

S_{n} =n

Find the sum of the first 12 terms of the arithmetic series 2+5+8+11+…

What is the sum

1+2+3+4+5++7+8+10 … +298+299

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