SOLUTION: in an arithmetic sequence, a1=2 and a40=80. what is the value of the sum of a2+a4+a6+a8+...a40?
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Question 411231: in an arithmetic sequence, a1=2 and a40=80. what is the value of the sum of a2+a4+a6+a8+...a40?
Answer by MathLover1(20850) (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
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