Golden Ratio.. or is it?

Let f n f_n denote the n th n^\text{th} Fibonacci number . Is f 4962 f_{4962} odd or even?

Cannot be determined Odd Neither Even

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2 solutions

For the first three Fibonnaci numbers, i.e. f 0 , f 1 , f 2 f_{0},f_{1},f_{2} the numbers are e v e n , o d d , o d d even, odd, odd Then we try to find the next three numbers: o d d + o d d = e v e n odd+odd=even o d d + e v e n = o d d odd+even=odd e v e n + o d d = o d d even+odd=odd This will continue recursively and thus, we conclude that f n f_{n} is even if and only if n n is divisible by 3. And so, 4 + 9 + 6 + 2 = 21 4+9+6+2=21 Hence, f 4962 f_{4962} is even.

Kenny Lau
Dec 1, 2014

In fact, since 4962 is divisible by 3, f(4962) is divisible by f(3), and f(3) is 2. (Property of fibonnaci series)

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