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12 October, 17:09

Arithmetic sequence and series algebra 2

Find S10 for 2+5+8 + ...

And

Find S10 for - 1+-7+-13+-19 + ...

+2
Answers (1)
  1. 12 October, 17:16
    0
    1: 29 2: - 55

    Step-by-step explanation:

    1: ... 8, 11, 14, 17, 20, 23, 26, 29 ...

    2: ... - 19, - 25, - 31, - 37, - 43, - 49, - 55 ...

    1: Find S10 for 2+5+8 ...

    first number: 2

    Common Difference: 3

    nth number to obtain: 10

    2: Find S10 for - 1+-7+-13+-19 ...

    First number: - 1

    Common Difference: - 6

    nth number to obtain: 10
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