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Before solving the question let us first understand the terms die, sample space, event and set notation form.

A die is a cubical shaped object on which a number of dots are marked where the number is from 1 to 6. Die is used in throwable games and board games.

In probability, the sample space of an experiment or any random trial is a set or collection of all possible outcomes or results of that experiment.

In probability, an event is a set of outcomes of an experiment to which probability is assigned.

Set notation is generally notation of objects in curly brackets that is in { }.

Now, we have given that dice are thrown. So, all possible outcomes will total numbers mentioned on it which are 1, 2, 3, 4, 5, 6.

So, sample space = { 1, 2, 3, 4, 5, 6 }

Now, there is an event A which is defined as the number is a perfect square. In sample space { 1, 2, 3, 4, 5, 6 }, there are only two perfect squares which are 1 and 4 as ${{\text{1}}^{\text{2}}}\text{=1, }{{\text{2}}^{\text{2}}}\text{=4}$.

So, Event A = { 1, 4 }