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Playing cards
A deck of playing cards will have $$52$$ cards altogether.

We can sort the $$52$$ cards into the four suits, namely, hearts, clubs, diamonds and spades. Each suit will comprise of $$13$$ cards.

$$13$$ cards in Spades $$+$$ $$13$$ cards in Clubs $$+$$ $$13$$ cards in Hearts $$+$$ $$13$$ cards in Diamond $$=$$ $$52$$ cards

Let us look at a set of diamond cards. Imagine all $$13$$ cards faced down and shuffled together. What do you think the probability would be that we pick $$5$$ of diamonds on the first attempt?

There are $$13$$ cards altogether and there is only one card to be picked.

So, the probability of $$5$$ of diamonds being picked at random $$=$$ $$\frac{1}{13}$$
Die
Die is a common plaything. It has $$6$$ faces, and there are numbers from $$1$$ to $$6$$ engraved on each of the faces. What do you think the possible outcomes be if a die is rolled once?

The possible outcomes include $$\{$$$$1$$, $$2$$, $$3$$, $$4$$, $$5$$, $$6$$$$\}$$.

What is the probability that the die lands on $$6$$ on the first attempt?

There are $$6$$ possible outcomes, and there is only $$1$$ favourable outcome.

Therefore, the probability of getting a $$6$$ on the first attempt $$=$$ $$\frac{1}{6}$$