Question

A single card is drawn from a deck. Find the probability of selecting a heart or a 9

Answer 1

Probability of heart = 13/52
probability of nine = 4/52

you add the probability because of the word "or" but must subtract the probability of drawing the 9 hearts because it's counted twice. counted once in heart probability and once again in nine probability.

probability of 9 <3 = 1/52

probability of heart or nine:
13/52 + 4/52 - 1/52 = 16/52
simplified;
= 4/13