S Sarah.P New Member Joined May 9, 2022 Messages 2 Gender Female HSC 2022 Jun 4, 2022 #1 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
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
C cossine Well-Known Member Joined Jul 24, 2020 Messages 650 Gender Male HSC 2017 Jun 4, 2022 #2 sum_of_series = sigma 2^r + 2r -1 You can see part of the expression is compose of geometric and arithmetic series.
sum_of_series = sigma 2^r + 2r -1 You can see part of the expression is compose of geometric and arithmetic series.
S Sarah.P New Member Joined May 9, 2022 Messages 2 Gender Female HSC 2022 Jun 4, 2022 #3 so we just need to subtitute the n and then find the sum of the geo and the arithmetic separately
C cossine Well-Known Member Joined Jul 24, 2020 Messages 650 Gender Male HSC 2017 Jun 4, 2022 #4 Sarah.P said: so we just need to subtitute the n and then find the sum of the geo and the arithmetic separately Click to expand... bingo
Sarah.P said: so we just need to subtitute the n and then find the sum of the geo and the arithmetic separately Click to expand... bingo
