noorbibi245 noorbibi245

23-07-2018
Mathematics

contestada

Find the sum of first 34 terms of the AP, whose nth term is given by an = 5-2n.

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LammettHash LammettHash

23-07-2018

[tex]\displaystyle\sum_{n=1}^{34}(5-2n)=5\sum_{n=1}^{34}-2\sum_{n=1}^{34}n[/tex]

[tex]=5\cdot34-2\cdot\dfrac{34\cdot35}2[/tex]

[tex]=1020[/tex]

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