State whether the collection of odd prime numbers less than $50$ will be a set or not.

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Solution

Odd prime numbers less than $50 =$ $3, 5, 7, 11, 13, 19, 17, 23, 29, 31, 37, 41, 43, 47$
(Prime numbers are the numbers having only two factors, one and the number itself)
Therefore the set will have well defined elements.
Hence it will be a set.

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