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3 years ago

5

Find the sum of the arithmetic series for which a_1 = 7, n = 31, and a_n = 127.

1 answer:

uranmaximum [27]3 years ago

8 0

Answer: 2077

There are 31 terms.

S₃₁ = 31(a₁+a₃₁)/2 = 31(7+127)/2 = 2077

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