Probability

A deck of 52 cards labeled 1 to 52 is shuffled at random. You do the follow steps:

1) Reveal the first card on the top of the deck and,

2) Shout the number '1'

Then you repeat the steps above, with the number shouted increases by 1 each time, until all cards are revealed.

What is the probability of at least having one card with a number label that matches the number shouted?

What if there is a deck with infinte cards instead of 52 cards?