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Stels [109]
3 years ago
11

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

<u>To find,</u>

  • 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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