State whether the given set is finite or infinite.
$C= \{x : x isamultipleof20\}$

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Solution

Infinite Sets: A set that contains unlimited(uncountable) number of elements is called an infinite set. Here, elements of the set cannot be counted.
In the given set, we have
$C= \{20, 40, 60, 80, . . . . .\}$ which cannot be counted and is uncountable.
Hence, the given set is infinite.

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