SOLUTION: Find the sum of all natural numbers less than 100 that are not divisible by 3?

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Question 1136308: Find the sum of all natural numbers less than 100 that are not divisible by 3?
Answer by ikleyn(52772) About Me  (Show Source):
You can put this solution on YOUR website!
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Step 1:  find the sum of all natural numbers from 1 to 99, inclusively.


Step 2:  find the sum of all natural numbers from 1 to 99 inclusively that are divisible by 3.


Step 3:  From the first sum, subtract the second and get the answer.

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For introductory lessons on arithmetic progressions see
    - Arithmetic progressions
    - The proofs of the formulas for arithmetic progressions
    - Problems on arithmetic progressions
    - Word problems on arithmetic progressions
in this site.

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".


Save the link to this textbook together with its description

Free of charge online textbook in ALGEBRA-II
https://www.algebra.com/algebra/homework/complex/ALGEBRA-II-YOUR-ONLINE-TEXTBOOK.lesson

into your archive and use when it is needed.