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Question
Given F1 = 1, F2 = 3 and Fn = Fn–1 + Fn–2 then F5 is
Options
3
5
8
11
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Solution
11
Explanation;
F1 = 1, F2 = 3
Fn = Fn–1 + Fn–2
F5 = F5–1 + F5–2 = F4 + F3
= F3 + F2 + F2 + F1
= F2 + F1 + F2 + F2 + F1
= 3 + 1 + 3 + 3 + 1 = 11
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