ejamesg2004 ejamesg2004
  • 24-08-2022
  • Mathematics
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find the sum of the first 20 terms of the arithmetic sequence 27,22,17...

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Ritmeks
Ritmeks Ritmeks
  • 26-08-2022

The sum of the first 20 terms of the Arithmetic sequence is 1490

The first is 27

The common difference is 5

n= 20

The first 20 terms can be calculated as follows

Sn= n/2[2a+(n-1) d]

S20= 20/2(2×27 + (20-1) 5

S20= 10(54 + 95)

S20= 10(149)

S20= 1,490

Hence the sum of the first 20 terms is 1490

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