The riddle “How is seven different from 1-10?” is a play on words. The answer is that “seven” has two letters that are different from the other numbers 1-10.
All the other numbers are spelled with a single letter that appears in their name, while “seven” has two different letters – “s” and “e”.
This riddle is an example of a word play or a trick question that uses language to create ambiguity and misdirection.