help answer please

Question

Giving a test to a group of students, the grades and gender are summarized below

A	B	C	Total
Male	12	5	20	37
Female	18	4	8	30
Total	30	9	28	67

If one student is chosen at random,

Find the probability that the student was male OR got an "B".

Answer 1

P(male or got a B) = P(male) + P(got a B) - P(male and got a B)

P(male) = 37/67

P(got a B) = 30./67

P(male and got a B) = 12/67

P(male of got a B) = 37/67 + 30/67 - 12/67 = 55/67