The shortest day in Fairbanks, Alaska only has 240 minutes of daylight and has 20 hours of darkness.  Write the ratio of daylight to darkness as a fraction.  Get the same units in the numerator as you have in the denominator.  Then cancel these units and reduce the fraction.

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
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Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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The shortest day in Fairbanks, Alaska only has 240 minutes of daylight and has 20 hours of darkness.  Write the ratio of daylight to darkness as a fraction.  Get the same units in the numerator as you have in the denominator.  Then cancel these units and reduce the fraction.

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