Math help (1 Viewer)

[Sarah.P]

Could anyone help me this question? Find the sum of the first n terms of a series given r^th term = 2^r +2r -1. Thank you so much

 

[cossine]

sum_of_series = sigma 2^r + 2r -1

You can see part of the expression is compose of geometric and arithmetic series.

 

[Sarah.P]

so we just need to subtitute the n and then find the sum of the geo and the arithmetic separately

 

[cossine]

so we just need to subtitute the n and then find the sum of the geo and the arithmetic separately

bingo