Assignment:
An airline has 15 flights from city A to city B and eight flights from city B to city C. In how many ways can you fly from city A to city B.
That is one type of problem another type is Karen has Five rabbits: 2 black, 2 white, 1 black and white. In how many ways can Karen select two of her rabbits and include at least one black rabbit.
Provide complete and step by step solution for the question and show calculations and use formulas.