Answer:
2160
Step-by-step explanation:
Formula for sum of first n terms of an arithmetic sequence:
Sₙ = n/2(2a₁ + (n - 1)d)
We can see that the first term is 2, common difference is 8 - 2 = 6. Since we're looking for the sum of the first 27, n = 27. Now, substitute:
S₂₇ = 27/2(2 × 2 + (27 - 1)6)
S₂₇ = 13.5(4 + (26)6)
S₂₇ = 13.5(160) = 2160
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Answers & Comments
Answer:
2160
Step-by-step explanation:
Formula for sum of first n terms of an arithmetic sequence:
Sₙ = n/2(2a₁ + (n - 1)d)
We can see that the first term is 2, common difference is 8 - 2 = 6. Since we're looking for the sum of the first 27, n = 27. Now, substitute:
S₂₇ = 27/2(2 × 2 + (27 - 1)6)
S₂₇ = 13.5(4 + (26)6)
S₂₇ = 13.5(160) = 2160