est: Chapter 10 Post-Test This Question: 1 pt 8 of 29 (4 complete) This Test: 2

Question

est: Chapter 10 Post-Test This Question: 1 pt 8 of 29 (4 complete) This Test: 2 Diana Baniak, searching for an Ecology class, knows that it must be in one of nine classrooms. Since the professor does not allow people to enter ater the has begun, and there is very ittle time left, she decides to try just four of the rooms at random. How many of the possbile ditferent selections of four rooms in locating the class? There are [ ] successful selections Enter your answer in the answer box O Type here to sear WE

Explanation / Answer

No of possibilities=P1+P2+P3+P4.

P1=Choosing directly the correct room=1;

P2=Choosing correct room in second chance=1C8 * 1 =8.

P3=Choosing correct room in third chance=1C8 *1C7* 1 =56.

P4=Choosing correct room in fourth chance=8*7*6*1 =336.

So no of possibilities=1+8+56+336=401.

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