there are 4 kinds in a standard deck of 52 cards.if a card is selected at random what is a probability it is not a king

Question

i would like to know how to solve these types of problems including probability and this problem is asking for the probability of not 

Answer 1

P(not a king) = 1 - P(the card is a king) = 1 - 4/52 = 48/52 = 12/13