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What the sum of the numbers from 1-200?

1 Answer
Jan 24, 2016

Answer:

#200 xx (1+200)/2 = 20100#

Explanation:

The sum of a finite arithmetic sequence is equal to the count of the number of terms multiplied by the average of the first and last terms.

In our case there are #200# terms with average value #(1+200)/2#