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9. Sequences, Series, & Induction

9. Sequences, Series, & Induction / Arithmetic Sequences / Problem 3

Write the equation that describes the nth term of the following arithmetic sequence: a_n = a_n-1 + 12, a₁ = 20
Then, use the equation to determine the 40th term of the sequence.

A

a_n = 20 + 12n, a₄₀ = 500

B

a_n = 8 + 12n, a₄₀ = 488

C

a_n = 20 - 12n, a₄₀ = -460

D

a_n = 8 - 12n, a₄₀ = -472

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