Given F1 = 1, F2 = 3 and Fn = Fn - 1 + Fn - 2 then F5 is …(1) 3 – InterviewSolution

1.

Given F1 = 1, F2 = 3 and Fn = Fn - 1 + Fn - 2 then F5 is …(1) 3 (2) 5(3) 8 (4) 11

Answer»

(4) 11

F_n = F_{n - 1} + F_{n - 2}

F₃ = F₂ + F₂ = 3 + 1 = 4

F₄ = F₃ + F₂ = 4 + 3 = 7

F₅ = F₄ + F₃ = 7 + 4 = 11

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