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“There are only 10 types of people in the world: Those who understand binary, and those who don’t”.
THE FUN IN THE JOKE
The pun derives from an ambiguous meaning: the expression 10 in the binary numeral system is equal to the decimal number two (you can check with the Decimal to binary converter on ConvertBinary.com).
In other words,: there are 10 types of people in this world, those who understand binary (1) and those who don’t (10).
The expression 10 IS NOT TEN, but 1 and 0, which in binary is… TWO.