Step: Check whether the given set is finite, infinite or null set
Given set: {squares of natural numbers}
Squares of natural numbers
=12,22,32,42,52,....
=1,4,9,16,25,.....
There are countless natural numbers and so their squares are also countless.
And we know that a set is said to be an infinite set, if it has an uncountable number of elements in it.
Hence, the given set is an infinite set.