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The hex version is good too -

There are 16 types of people in the world: those who understand hexadecimal and F the rest.

The real answer is:

Those who don't understand binary

Those that think its a binary joke

Those who understand trinary

no no it is:

Those who don't understand binary

Those that think its a binary joke

Those that think its a trinary joke

Those who understand base 4

...

One can generalize this joke and use mathematical Induction to tell infinite jokes.

A human and a alien are talking about their number systems

Human: Oh, I see you use base 4. We use base 10.

Alien: WTF is base 4? We use base 10.

Now this I like!

Those who don't understand binary, those that do, and those who count in Gray codes.

There are 10 kinds of people in the world:

Those who understand little-endian notation.