Question

Given a=8 ,d=-5 and n=22 find an and sn

Answer 1

Answer:

$sn = \frac{n}{2}(a + (n - 1) \times d))$

$= \frac{22}{2} (8 +21 \times 5)$

$= 11(8 + 105)$

$= 1243$

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