Question

Given F1=1,F2=3 and Fn=Fn-1+Fn-2 then F5 is a) 3 b)5 c)8 d)9​

Answer 1

answer is 11

the series is 1,3,4,7,11,18...

Answer 2

F₅= 11

Step-by-step explanation:

F₁ = 2

F₂ = 3

Fₙ = Fₙ₋₁ + Fₙ₋₂

putting n = 3

=> F₃ = F₂ + F₁

=>  F₃ = 3 + 1

=> F₃ = 4

putting n = 4

=> F₄= F₃ + F₂

=> F₄= 4 + 3

=> F₄= 7

putting n = 5

=> F₅= F₄ + F₃

=> F₅= 7 + 4

=> F₅= 11

F₅= 11

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