SOLUTION: in an arithmetic sequence, a1=2 and a40=80. what is the value of the sum of all even terms only?
Algebra.Com
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(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
RELATED QUESTIONS
in an arithmetic sequence, a1=2 and a40=80. what is the value of the sum of... (answered by MathLover1)
An arithmetic sequence of 15 terms has a sum of 3060. The common difference and each... (answered by greenestamps)
If a1 = 4 and d = -2 what are the first four terms of the arithmetic... (answered by Fombitz)
1) In an arithmetic sequence, a4=8 and a7=26. Find a1 and d. Write the first 5 terms of... (answered by mananth,ikleyn)
The sum of the first n terms of an arithmetic sequence is (2n^2)-n. Find the general term (answered by MathLover1)
I asked this question before, but I did not get all the parts to the uestion posted for... (answered by longjonsilver)
Question: The sum of 40 terms of a certain arithmetic sequence is 430, while the sum of... (answered by math_tutor2020,muthbab@gmail.com)
An arithmetic sequence a1,a2,......a100 has a sum of 15 000. Finf the first term and the... (answered by ikleyn,greenestamps)
All terms of an arithmetic sequence are integers. The first term is 535, the last
term... (answered by Fombitz)