 Hello, I am welcome to the session. I am Deepika here. Let's discuss the question which says Determine probability of E upon F Mother father and son line up at random for a family picture E is the event son on one end and F is the event father in middle So let's start the solution now the sample space of the given experiment that is the experiment of lining up Mother father and son can be described as S is equal to M F S that is mother on one end father in the middle and son on the other end S F that is mother on one end son in the middle and father on the other end similarly we have F M S F S M S F M S M F So the sample space has six outcomes Now we are given E is the event that son on one end and F is the event father in middle So the outcomes of E are M F S F M S S F M and S M F and The outcomes of F are S F M and M F S Clearly the outcomes of E intersection F are S F M and M F S Now probability of E is equal to 4 upon 6 which is equal to 2 upon 3 and probability of F is equal to 2 upon 6 which is equal to 1 upon 3 and probability of E intersection F is also 2 upon 6 which is equal to 1 upon 3 Now we know that the probability of E upon F is given by the formula probability of E intersection F upon probability of F and this is equal to 1 upon 3 into 3 upon 1 and this is equal to 1 Hence the answer for this question is 1 So this completes our session I hope the solution is clear to you Bye and have a nice day