Question

Determine the sum of the series
11+8+5+2...-166

Answer 1

Answer:

-4650

Step-by-step explanation:

A= 11, An = -166, d = -3
An = A+(n-1)d
-166 = 11 +(n-1)(-3)
-177 = -3n +3
-180= -3n
n = 60

Sn = n(An+A)/2
Sn = 60(-166+11)/2
Sn = 30 (-155)
Sn = -4650.

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