Question

: Find the sum of the first 22 terms of the AP: 8,3, -2, ...​

Answer 1

Answer:

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Answer 2

Step-by-step explanation:

$s = \frac{n}{2}(2a + (n - 1)d) \\ a = 8 \: \: \: n = 22 \: \: \: d = - 5 \\ s = \frac{22}{2} (2 \times 8 + (22 - 1) - 5) \\ = 11(16 + 21 \times - 5) \\ = 11(16 - 105) \\ = 11 \times - 78 \\ - 858$