State which of the following sets are finite and which are infinite.
The set of men who have landed on the moon.

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Solution

A set that contains countable number of different members is called a finite set and a set which contains unlimited or uncountable number of different members is called an infinite set.
Given set:
The set of men who have landed on the moon.
The number of people landed on moon till date is $12$
Therefore, The set of number of people landed on moon are countable number.
Hence, the set of men who have landed on the moon is finite set.

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