Your task is express the sum of the following arithmetic series for n = 14:

S(n) = 11 + 13 + 15 + 17 + ... + 2n+9 + 2n+11

Correct result:

S =  336


a1=11 d=2 an=11+2(n1)  S14=14a1+a142=1411+372=336

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