Geo777
23.01.2022 •
Mathematics
The population of Exton is 12,000 and the population of Whyton is 13,600. What is the percentage difference if the average population is 12,800?
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Ответ:
Go to the 9th row of the triangle (mind you the first row is 0), the 2nd is 1st row
9th row: 1 9 36 84 126 126 84 36 9 1
Now choose the 4th column (excluding the 1st , you will get 126 :
so 126 is the number of combination requested:
PROOF: ⁹C₄ = 9!/(9-4)! .4! = (9!)/5!.4! = 126