HardRiddle #1384
Spell out any odd number in English, as big as you like. Which letter are you guaranteed to use?
Hint: Look at how every odd number's name ends.
Answer
E
Every odd number's name ends in one, three, five, seven, nine, eleven, thirteen, fifteen, seventeen or nineteen, and all of those contain an E. No other letter is shared by all of them.
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