5th Grade Easy Difficulty Problem (Assume that the first number is 1, not zero.)

Number Theory Level 2

Is the 100th number of the Fibonacci sequence odd, or even? 

   Hint: See for the first few numbers of the Fibonacci sequence; is it odd or even? There is no need to count this!
It could be both Odd Even I would be guessing

Shu Hung Wang by Shu Hung Wang , 16, USA

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1 solution

Shu Hung Wang
Dec 13, 2018

1,1,2,3,5,8. Do you see a pattern? Yes! It's odd, odd, and even! Since that it starts on 1, not zero, so 100 divided by 3 to the nearest whole number is 33. 33 times 3 is 99. So the 99th number is even, so the one hundredth number has to be odd.

2 Helpful 0 Interesting 0 Brilliant 0 Confused

This is also problem of the week 12/3/2018!!

Shu Hung Wang - 2 years, 6 months ago

I guessed it.

Yukan Wu - 2 years, 4 months ago

Actually, this is a kindergarten question, not a fifth grade one.

Shu Hung Wang - 2 years, 4 months ago

Kindergarten enrichment question, just to clarify!

Shu Hung Wang - 2 years ago

And if you did not solve this question, this does not mean that you are bad at math (Assuming that the people that are solving this are either fifth graders or adults! (Probably just a careless error, anyway!) :)

Shu Hung Wang - 2 years ago

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