Need algebra help with the terms in the 1st sum that are consecutive terms of an arithmetic sequ

Algebra
Tutor: None Selected Time limit: 1 Day

Nov 29th, 2015

Thank you for the opportunity to help you with your question!

a. the sum is: -5-3-1+1+3..271= -9+ 136^2 =18487    [As 2n-1 =271 and n=136 and sum of first n odd digits is=n^2]

b. the sum is: 3*116*(116+1)/2+3*116=20706

Please let me know if you need any clarification. I'm always happy to answer your questions.
Nov 29th, 2015

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