Question 6872
Probability is found by dividing the number of desired outcomes by the number of total possible outcomes. 
A deck of cards has 52 cards in it, so the divisor would be 52.
The probability of drawing an Ace (there are four) is 4/52. 
The probability of drawing an Ace of Hearts (there is only one, or we shoot you) is 1/52.
The probability of drawing any old card (there are 52) is 52/52 -- certainty!