SOLUTION: in an arithmetic sequence, a1=2 and a40=80. what is the value of the sum of all even terms only?

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 Question 411233: in an arithmetic sequence, a1=2 and a40=80. what is the value of the sum of all even terms only?Answer by MathLover1(6813)   (Show Source): You can put this solution on YOUR website! To find the sum of a certain number of terms of an arithmetic sequence: where is the sum of terms (nth partial sum), is the first term, an is the nth term given: and to find: the sum of a2+a4+a6+a8+...a40