I need help with a math equation

Question

You are dealt one card from a 52- card deck. Find the probability that you are dealt a spade or a picture card.

Answer 1

P(spade) = 13/52 =1/4

P(face card) = 12/52 = 3/13

P(face card which is a spade) = 3/52

P(spade or face card) = 1/4 + 3/13 - 3/52

= (13+12-3)/52 = 22/52 = 11/26