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50

For the spelling reason that (like 20 and 30) its name contains different letters from the numbers that represent its multiple of 10, i.e. fif instead of five.

40 - fo(u)rty

60 - sixty

70 - seventy

80 - eighty

90 - ninety

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70

It is the only one of the numbers that contains only three different prime factors occurring once (2 x 5 x 7).

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Q: What is the odd one out 40 50 60 70 80 90 and why?
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