1. ## ...easy one, EASY!

During the Christmas holidays 42 students from a group of 85 VCE students found vacation employment while 73 students went away on holidays. Assuming that every student had at least a job or went on a holiday, what is the probability that a randomly selected student worked throughout the holidays (that is, did not go away on holidays), given that he/she had a job?

Please show any working out to the above. Any help will be appreciated!

2. Originally Posted by Joker37
During the Christmas holidays 42 students from a group of 85 VCE students found vacation employment while 73 students went away on holidays. Assuming that every student had at least a job or went on a holiday, what is the probability that a randomly selected student worked throughout the holidays (that is, did not go away on holidays), given that he/she had a job?

Please show any working out to the above. Any help will be appreciated!
I suggest you start by drawing a Venn diagram. You will need to solve the following three simple equations simultaneously:

a + x = 42

b + x = 73

a + x + b = 85

And in future please use more descriptive post titles than "...easy one, EASY!"