Question

Out of 100 emails, 60 are spam and 48 of those contain the word buy. Of the remaining 40 emails that are not spam, only 4 emails contain the word buy. Given that an email is spam, what is the probability that it contains the word buy?

Answer 1

48:60
24:30
12:15
4:5

or

44:60
22:30
11:15

depending upon weather or not 48 is including the 4 that aren't spam