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4 + 9 + 14 + 19 + ... + 69 = 

 

The sum of the sequence is = 

 Sep 6, 2017
 #1
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n = [69 - 4] / 5 + 1 = 14 terms

[4 + 69] / 2 x 14 =

 73 / 2 x 14 = 511

 Sep 7, 2017

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