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Luba_88 [7]
4 years ago
8

Help me guys. I don’t get this one. Thank you

Mathematics
1 answer:
Usimov [2.4K]4 years ago
8 0

Answer:

207

Step-by-step explanation:

The sum to n terms of an arithmetic sequence is

S_{n} = \frac{n}{2} [ 2a₁ + (n - 1)d ]

where a₁ is the first term and d the common difference

Here a₁ = 37 and d = 34 - 37 = - 3 , thus

S_{18} = \frac{18}{2} [ (2 × 37) + (17 × - 3) ]

     = 9( 74 - 51)

     = 9 × 23

     = 207

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