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A sequence is defined by a₀ = 0, a₁ = 1 and aₙ = aₙ₋₁ + 2aₙ₋₂ for n ≥ 2. The value of a₅ is
- A9
- B21
- C13
- D11
Correct answer: D
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A sequence is defined by a₀ = 0, a₁ = 1 and aₙ = aₙ₋₁ + 2aₙ₋₂ for n ≥ 2. The value of a₅ is