Question 658036
The probability of drawing a heart is 13/52.
The probability of drawing an ace is 4/52. 
If the question asked for the probability of drawing a heart AND an ace, you would multiply the probabilities. Since it asks for the probability of a heart OR an ace, you add the probabilities. 
13/52 + 4/52 =17/52 

But by solving in this way you have counted ace of heart twice so if we simply calculate probability as Favorable cases / total cases it will give us 16/52 .