Eight Sprinters are running in a race. If there are no ties, in how many ways can:

a. First Place be awarded?

b. first and second places be awarded

c. first, second, and third places be awarded

d. all eight places be awarded
this isn't a trick question, i just dont know how to solve it, can someone please give me the answer to a, b, c, and d, and also explain what you did to get your answer