Hi, here is my question. From a 52 card deck, what is the probability that I will pull a red or a 7. I got 1/26. Is this right.?
method 1: count how many choices you have:
there are 26 red cards, including 2 7s, besides that, there are two 7s, so that we have 28 choices in all out of 52. thus the probability is 28/52 = 7/13
method 2: use the formula
for two events and
here that translates to