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That's the probability that you chose one of these 12 cards:
3♥ 4♥ 5♥
3♦ 4♦ 5♦
3♠ 4♠ 5♠
3♣ 4♣ 5♣
out of these 52 cards:
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♣ 2♣ 3♣ 4♣ 5♣ 6♣ 7♣ 8♣ 9♣ 10♣ J♣ Q♣ K♣
That's a probability of 12 out of 52, and "out of" means "over", so
that's a probability of 12 over 52 or
and that fraction
reduces to 3/13.
Edwin