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Varvara68 [4.7K]
3 years ago
11

7. Find S 14 for the arithmetic sequence. 101+98+95+92+..

Mathematics
1 answer:
Art [367]3 years ago
3 0

Step-by-step explanation:

S _{n} =  \frac{n}{2} (2a + (n - 1)d) \\ S _{14} =  \frac{14}{2} ((2 \times 101) + (14 - 1) \times -3) \\  =1,141

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