Saturday

April 19, 2014

April 19, 2014

Posted by **Lindz** on Monday, September 25, 2006 at 5:26pm.

a)How many different medications with one active ingredient and two preser-

vatives can the lab produce?

b)How many different medications with two active ingredients and one

preservative can the lab produce?

c)How many different medications with one active ingredient and at most

two preservatives can the lab produce?

For a) there are 10 choices for the active ingred., and 5C2 (5 choose 2) ways to select the preservative, times the number of presentations. Now use the multiplication rule.

For b) there are 10C2 ingred., and 5C2 preserv. times the number of presentations.

For c) there are 10C1 ways to select the ingredient, 5C1 + 5C2 ways for the preserv, and 2 presentations.

Note: nCm means n choose m.

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