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Find the sum of the integers from 17 to 82 inclusive.
Guest Feb 3, 2012
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anne tew:

Find the sum of the integers from 17 to 82 inclusive.



82+17=99

1 row: 17, 18, 19 ...
2 row: 82, 81, 80 ...
column-sum is always: 99

"17 to 82 inclusive" => 66 elements

66 * 99 / 2 = 3267
admin  Feb 3, 2012

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