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08.04.2020 •
Mathematics
Call Letters In 1923, the Federal Communications Commis- sion directed that all new radio stations east of the Mississippi River have call letters beginning with the letter W. How many different three- or four-letter call letters are possible
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Ответ:
30
three- or four-letter call letters are possible.
Step-by-step explanation:
three- or four-letter call letters that are possible will be 3 factorial plus 4 factorial
3! + 4!
3! = 3 ×2 ×1 = 6
4! = 4 × 3 × 2 × 1 = 24
3! + 4! = 6 + 24 = 30
Note that in Probability, or means +
Ответ:
22.9 in3 or the first option.
https:/xxx/mathbitsnotebook.com/Geometry/Modeling/MDModelingPractice.html
look at this link, it likely has all of your questions with answers (remove the xxx)