Question 12 There are 9 rolls of film in a box and 3 are defective. Two rolls ar

Question

Question 12

There are 9 rolls of film in a box and 3 are defective. Two rolls are selected without replacement. What is the probability of selecting a defective roll followed by another defective roll?

0.67

0.33

2.67

0.08

Question 13

An electronics firm sells four models of stereo receivers, three CD decks, and six speaker brands. When the three types of components are sold together, they form a "system." How many different systems can the electronics firm offer?

169

72

13

36

Question 14

You have the assignment of designing color codes for different parts. Two colors are used on each part, but a combination of two colors used for one part cannot be rearranged and used to identify a different part. This means that if yellow and violet were used to identify a camshaft, violet and yellow (or any other combination of these two colors) could not be used to identify a pinion gear. If there are 55 combinations, how many colors were available?

11

15

9

13

0.67

0.33

2.67

0.08

Explanation / Answer

12. P(first defective)=3/9

P(second defective)=2/8

So required probability is 3/9*2/8=0.08

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