SOLUTION: 2+4+6+.....2n=n(n+1)

Algebra ->  Decimal-numbers -> SOLUTION: 2+4+6+.....2n=n(n+1)      Log On


   

Question 1011842: 2+4+6+.....2n=n(n+1)
Answer by ikleyn(52769) About Me  (Show Source):
You can put this solution on YOUR website!
.
2+4+6+.....2n = 2*(1 + 2 + 3 + . . . + n) = 2%2A%28%28n%2A%28n%2B1%29%29%2F2%29 = n*(n+1).

By the way, were there no a question in your post.