In a standard pack of 52 playing cards, we have:

♥ 2 3 4 5 6 7 8 9 10 J Q K A
♦ 2 3 4 5 6 7 8 9 10 J Q K A
♣ 2 3 4 5 6 7 8 9 10 J Q K A
♠ 2 3 4 5 6 7 8 9 10 J Q K A

There are 4 aces in a normal pack. So the probability of getting an ace is:

`P("ace")=4/52 = 1/13`

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