Posted by **Sharon** on Sunday, May 27, 2012 at 6:33pm.

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.

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