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31 Jan 2008, 21:48
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Janice is decorating her house by arranging XMas lights along the top of her entrance door. The XMas lights come in 5 different colors and each of the lights costs 39 cents at regular price. Janice has 2 dollars to spend on XMas lights, and she buys the lights during a holiday sale when the store gives away 1 light for every 4 purchased at the regular price. What is the maximum number of light decorations that she can create if she must use all the lights purchased?
5
60
120
360
720
5
60
120
360
720
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31 Jan 2008, 22:18
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D
2/0.39~5
n=5+1=6
\(N=\frac{P^6_6}{P^2_2}=360\)
but really tricky for me
I had problem with understanding. Can she buy only one-color lights? Yes!
Therefore, the number of all possible light decorations have to be more than 360. But question is "maximum number after buying"...tricky
maybe I'm wrong....
+1
2/0.39~5
n=5+1=6
\(N=\frac{P^6_6}{P^2_2}=360\)
but really tricky for me
I had problem with understanding. Can she buy only one-color lights? Yes!
Therefore, the number of all possible light decorations have to be more than 360. But question is "maximum number after buying"...tricky
maybe I'm wrong....
+1
01 Feb 2008, 04:11
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Bookmarks
walker
in case of repetition we have total elements!/repeating elements!, thus 6!/2!, 360. you're always right!
