@thoughtfulmongoose Let a=2x and b=2y, then the question is asking for the GCD of 2x and 4y. Obviously 2 is a common divisor, but we don't know if x has any more 2s in it. If x has one more factor of 2 and y has none then the greatest common divisor is 4. So the answer should be NEI(not enough info)

@sqwishy nice

@zestfulalbatross-0 I did the same way except that I thought of the clusters as immovable bundles. I think clusters is a better way of illustrating the problems.

@empathicmonkey I guess the editor made an error and typed the question wrong

@RZ923 Well I can play chess but I live in china so maybe a live one

@genuineopossum Same!

@wisegiraffe I got this too first, but I noticed it tricked me. You add four of the same variables and subtract one of the same variable, so you get 3

@debbie You only needed to do 2^9 since they both are prime, and their are know common denominators in the choices

@RR Art of Problem Solving has a lot of great videos and podcasts that you can watch and listen to without an account.