5. Seven slips of paper with the digits 1 to 7 are placed in a large jar. After thoroughly mixing the slips of paper, two slips are picked without replacement.
a. Explain the difference between 7P2 and 7????2 in terms of the digits selected.
b. Describe a situation in which 7P2 is the total number of outcomes.
c. Describe a situation in which 7????2 is the total number of outcomes.
d. What is the relationship between 7P2 and 7????2?