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3 years ago

Find the sum of 1st 18 terms of an AP whose nth term is 3-2n.

Mathematics

1 answer:

cricket20 [7]3 years ago

3 0

Answer:

-288

Step-by-step explanation:

<h3>Given AP</h3>

t(n) = 3 - 2n

The sum of first 18 terms

<h3>Solution</h3>

Sn = 1/2n(t(1) + t(n))

<u>The first and 18th terms as per the formula</u>

t(1) = 3 - 2 = 1
t(18) = 3 - 18*2 = 3 - 36 = -33
S18 = 1/2*18(1 - 33) = 9*(-32) = -288

<u>Answer is</u> -288

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