SOLUTION: find the sum of all integers between 50and500 which are divisible by 7.
Algebra.Com
Question 1072281: find the sum of all integers between 50and500 which are divisible by 7.
Answer by ikleyn(52909) (Show Source): You can put this solution on YOUR website!
.
Arithmetic progression.
The first term is 56.
The common difference is 7.
The last term is 497.
The number of the terms is n = + 1.
The rest is on you.
For the introductory lessons on arithmetic progressions see
- Arithmetic progressions
- The proofs of the formulas for arithmetic progressions
in this site.
There is a bunch of lessons on arithmetic progressions in this site:
- Arithmetic progressions
- The proofs of the formulas for arithmetic progressions
- Problems on arithmetic progressions
- Word problems on arithmetic progressions
- Mathematical induction and arithmetic progressions
- One characteristic property of arithmetic progressions
- Solved problems on arithmetic progressions
Also, you have this free of charge online textbook in ALGEBRA-II in this site
- ALGEBRA-II - YOUR ONLINE TEXTBOOK.
The referred lessons are the part of this online textbook under the topic "Arithmetic progressions".
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