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konstantin123 [22]
3 years ago
15

Find Sn for the given arithmetic series a1=-26 d=-9 n=24

Mathematics
1 answer:
ryzh [129]3 years ago
5 0

Answer:

- 3108

Step-by-step explanation:

The sum to n terms of an arithmetic series is

S_{n} = \frac{n}{2} [ 2a_{1} + (n - 1)d ]

Substitute the given values into the formula

S_{24} = \frac{24}{2} [ (2 × - 26) + (23 × - 9) ]

                          = 12 ( - 52 - 207 )

                         = 12 × - 259 = - 3108

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