What is the sum of the series? 20 sigma (5-n) n-1 A-220 B-110 C-95 D110

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asked Jun 8, 2019 208k views

2 votes

What is the sum of the series?

20
sigma (5-n)
n-1

A-220
B-110
C-95
D110

Mathematics
high-school

Faheem asked

by Faheem

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1 Answer

6 votes

$\bf \sum\limits_(n=1)^(20)~5-n\implies \sum\limits_(n=1)^(20)~5~~-~~\sum\limits_(n=1)^(20)~n\implies 20\cdot 5~~-~~\cfrac{20(20+1)}{2} \\\\\\ 100~~-~~210\implies -110$

Nistor Alexandru answered Jun 13, 2019

by Nistor Alexandru

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