It is the infinite set (-∞, 50)
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The set of positive integers less than 50 is finite (there are 49).The set of all integers less than 50 is infinite, because it includes an infinite number of negative numbers.
There are 15 prime numbers less than 50
The set of positive odd integers.
31, 37, 41, 43, 47 & 49.
Anything from 50 to 99