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Using the following information, find the sum of the given arithmetic series.

a1= 16, d = -9, n = 18

User Usersina
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1 Answer

2 votes

Answer:

Sn = n÷2[2a+(n-1)d]

=18÷2[2(16)+(18-1)(-9)]

Sn=-1089

Explanation:

First write out the formula for sum in arithmetic series

Then substitute the given information

Then punch everything as it is together with the signs to get the answer

User Rithesh Rao
by
7.8k points

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