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March 28, 2015

March 28, 2015

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 -
**Steve**, Wednesday, January 9, 2013 at 11:03amthink of an arithmetic sequence where

a=60 and d=1. The sum of the 1st 21 terms is thus

21/2(2*60+20*1) = 1470

or, since each number is 20 more than the terms of the first sequence, add 21*20 = 400, to get 1470

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