I am all of the way stumped on this. Every answer I type in is incorrect

A test was given to a group of students. The grades and gender are summarized below A B C Total Male 15 2 4 21 Female 13 9 12 34 Total 28 11 16 55 If one student is chosen at random from those who took the test, find the probability that the student got a 'a 'B" GIVEN they are female. Write your answer as a reduced fraction