posted by Sharon .
A store sells rings with birthstones selected from the 12 different months of the year. The stones are arranged in a row.
Part A: Mary wants a ring with a topaz, a sapphire, and a ruby set in a line. Write and evaluate an expression to show how many ways the 3 stones can be arranged?
Part B: How many permutations are possible with 4 different stones of any month?
Part C: Can more rings be made with 5 different stones than with 4 different stones? Explain.
A)3!=6 ways B)4!=24 ways C)5!=120 ways ...since there is 12 to choose from.
That's on my test too!!!