a permutation of a finite set is odd if it can be written as the functional composition of an odd number of transpositions; see even and odd permutations
In probability theory, the odds in favour of an event is the ratio of the event's probability to the complementary probability.
Odd (name), is a name of Old Norse origin, the 11th most common male name in Norway (coincidentally, Even is also a common Norwegian name). In Old Norse the word means the sharp end of a weapon, e.g. edge of a sword or spear/arrow head.
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