100 + 95 + 90 + 85 summation notation series solution

asked Mar 12, 2018 138k views

2 votes

by Boban

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5 votes

Since we are decreasing by 5 each time, we can build up a series formula first.

S_n = (n)/(2)(2a + (n - 1)d)

Now, adding summation notation, we produce:

$\sum_(k = 1)^(n)[(k)/(2)(200 - 5(k - 1))]$

Sandeep Thar answered Mar 17, 2018

9.0k points

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