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September 18, 2014

September 18, 2014

Posted by **Tiffany** on Saturday, June 7, 2014 at 8:04pm.

=(1+n)+(1+n)+(1+n)+...

How many copies of n+1 are in there in the second line?

with n=6 and n=7

- Number Theory -
**Steve**, Saturday, June 7, 2014 at 10:47pmSince the n numbers are divided up in pairs, I'd say n/2 copies.

Hence the formula for the sum: n(n+1)/2

Technically, that's [n+1]/2 where [] is the greatest-integer function.

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