Permutations and Combinations Answers

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Janice determined there were 10 possible outcomes when tossing two coins and spinning a spinner numbered 1 through 6. What is the correct number? What might have been Janice’s error?

A
3; There are only 3 events.
B
6; There is only 1 possible outcome for the coins.
C
24; She added the number of possibilities instead of multiplying.
D
36; The spinner was spun twice.
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10

A combination lock has a code consisting of 3 numbers, each of which can be 0 to 39, with numbers repeated. Jillian says that there are only 120 possible codes. Is Jillian correct? If not, explain her error.

Answer:

No, Jillian is not correct. According to the fundamental counting principle, the total number of possible codes would be (40)(40)(40) 64,000. Jillian multiplied by 3 instead of multiplying the number of possibilities for each digit.

11

Check all that you included in your response.

A
The fundamental counting principle says to multiply the number of possibilities for each choice.
B
Jillian multiplied 40 times 3.

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