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July 4, 2015

Homework Help: algebra

Posted by Annie on Friday, February 8, 2008 at 8:26am.

The sum of the first n counting numbers 1 + 2 + 3 + 4 + 5 ... + n is given by S = n/2(1 + n).

a) Find the sum of the numbers 14 to 40 inclusive

Answer is 729. But i don't get why.

Someone explain what the qestion means by "inclusive" please ><!

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