SOLUTION: Use the gauss approach to find a formula for the sum of the even numbers from 2 to 2n 2+4+6+...2n

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Question 1044137: Use the gauss approach to find a formula for the sum of the even numbers from 2 to 2n 2+4+6+...2n
Answer by ikleyn(52778) About Me  (Show Source):
You can put this solution on YOUR website!
.
It was done in the lesson
    - The proofs of the formulas for arithmetic progressions
for an arbitrary arithmetic progression.

See the proof after the formula (3).