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December 19, 2014

December 19, 2014

Posted by **Sarah** on Wednesday, January 9, 2013 at 1:45am.

Please help me find the pattern and how to use it instead of adding 60+61+62+63..... etc.

- Math -
**MathMate**, Wednesday, January 9, 2013 at 4:59amUse the Gauss method:

60+61+62...+70+71...+80

80+79+78+..+70+69...+60

Add the two lines, you will get the sum 140 21 times. So half the sum is 70*21=1470.

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