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If the sum of the first …

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If the sum of the first 14 terms of an AP is 1050 and its first term is 10 find the 20th term
  • 3 answers

Rohan Baisoya 1 year, 10 months ago

20th term is200
Here, S14 = 1050, n = 14, a = 10. We know that Sn = (n2)[2a+(n−1)d] Substituting the values we have, 1050=(142)[20+13d] ⇒1050=140+91d ⇒910=91d ⇒d=10 Therefore, a20=10+(20–1)×10=200 i.e. 20th term is 200.

D.Thrishanth Reddy 1 year, 10 months ago

200 is the 20th term
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