# Answer to Question #20504 in Calculus for Riley

Question #20504

Find the sum of the arithmetic series using a formula. 2 + 4 + 6 + ... + 374

Expert's answer

Sn=(a1+an)*n/2

in our case a1=2, an=374, n=187

Sn=(2+374)*187/2=(1+187)*187=188*187=35156

in our case a1=2, an=374, n=187

Sn=(2+374)*187/2=(1+187)*187=188*187=35156

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