Two wives and their husbands have tickets for a play. They have the first four seats on the left side of the center aisle. They will be arriving separately from their jobs. So they agree to take their seats from the inside to the aisle in whatever order they arrive. There is a probability of that they will all have arrived by curtain time.

a. What is the probability that each wife will be seated next to her husband?

b. What is the probability that they all arrive by curtain time and that each wife is seated next to her husband?

View the original article here