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22 votes
120
∑ (3n-6)
n=1
Find the sum.

User Floyd
by
8.2k points

1 Answer

1 vote

Answer:

21300

Explanation:

120∑n=13n−4

Split the summation into smaller summations that fit the summation rules.

120∑n=1 3n−4=3120∑n=1 n+120∑n=1 −4

Evaluate

3120∑n=1 n.

21780

Evaluate

120∑n=1 −4 −480

Add the results of the summations.

21780−480

Subtract 480 from 21780.

21300

User Ashling
by
7.8k points
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