Check whether the given phrase describes a well-defined set or not.
“All odd natural numbers less than 40.”

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Solution

It is a well-defined set as its elements can be easily defined as all the odd numbers (numbers not divisible by 2) starting from i.e. $1, 3, 5, 7 . . . . . . . 39$ .
Hence, the given phrase is a well-defined set.

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