14. Sequences & Series

13–20. Explicit formulas Write the first four terms of the sequence { aₙ }∞ₙ₌₁. 

aₙ = (−1)ⁿ / 2ⁿ

13–20. Explicit formulas Write the first four terms of the sequence { aₙ }∞ₙ₌₁. 

aₙ = (2ⁿ⁺¹) / (2ⁿ + 1)

13–20. Explicit formulas Write the first four terms of the sequence { aₙ }∞ₙ₌₁. 

aₙ = 1 + sin(πn / 2)

21–26. Recurrence relations Write the first four terms of the sequence {aₙ} defined by the following recurrence relations.

aₙ₊₁ = 2aₙ; a₁ = 2

"21–26. Recurrence relations Write the first four terms of the sequence {aₙ} defined by the following recurrence relations.

aₙ₊₁ = 3aₙ-12; a₁ = 10

35–44. Limits of sequences Write the terms a₁, a₂, a₃, and a₄ of the following sequences. If the sequence appears to converge, make a conjecture about its limit. If the sequence diverges, explain why. 

aₙ = 1⁄10ⁿ; n = 1, 2, 3, …

35–44. Limits of sequences Write the terms a₁, a₂, a₃, and a₄ of the following sequences. If the sequence appears to converge, make a conjecture about its limit. If the sequence diverges, explain why. 

aₙ = 3 + cos(π*ⁿ) ; n = 1, 2, 3, …

35–44. Limits of sequences Write the terms a₁, a₂, a₃, and a₄ of the following sequences. If the sequence appears to converge, make a conjecture about its limit. If the sequence diverges, explain why. 

{Use of Tech} aₙ₊₁ = (aₙ⁄₁₁ )+ 50;a₀ = 50

13–52. Limits of sequences

Find the limit of the following sequences or determine that the sequence diverges.

{n³⁄(n⁴ + 1)}  

13–52. Limits of sequences

Find the limit of the following sequences or determine that the sequence diverges.

{(3n³ − 1)⁄(2n³ + 1)}

13–52. Limits of sequences

Find the limit of the following sequences or determine that the sequence diverges.

{tan⁻¹(10n⁄(10n + 4))}  

13–52. Limits of sequences

Find the limit of the following sequences or determine that the sequence diverges.

{1 + cos(1⁄n)}

13–52. Limits of sequences

Find the limit of the following sequences or determine that the sequence diverges.

{(√(4n⁴ + 3n))⁄(8n² + 1)}  

13–52. Limits of sequences

Find the limit of the following sequences or determine that the sequence diverges.

{2ⁿ⁺¹3⁻ⁿ}

13–52. Limits of sequences

Find the limit of the following sequences or determine that the sequence diverges.

{(3ⁿ⁺¹ + 3)⁄3ⁿ}