I'm doing a high school level question and one of the questions is figuring out which of the Fibonacci sequence numbers must be even. The 61st, 62nd, 63rd, 64th, or 65th. And the only information I'm given is how the sequence is defined recursively.
Apart from using my calculator and testing out each number, I'm not sure how I'm supposed to solve this without using college-level mathematics. (Btw, I'm allowed a calculator so maybe the question is just testing your ability to use it)