waec model questions vol1 2023 mathematics

Objective • Question 8

Question 8 WAEC_MODEL_QUESTIONS_VOL1 • 2023
A sequence {a_n} is defined by a₁ = 2 and for n ≥ 1, a_{n+1} = 3a_n + (-1)^n. Determine the 5th term a₅ and the sum S₅ = a₁ + a₂ + a₃ + a₄ + a₅.
Answer Options
A. a₅ = 140; S₅ = 209
B. a₅ = 141; S₅ = 211
C. a₅ = 143; S₅ = 213
Correct Answer D. a₅ = 142; S₅ = 212
Correct Answer
D
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