SOLUTION: Solve the equation {{{(matrix(2,1,n,2))}}}{{{""-""}}}{{{(matrix(2,1,n,1))}}}{{{""=""}}}{{{20}}} where n is a natural number

Question 945597: Solve the equation
where n is a natural number

Answer by Edwin McCravy(20054) (Show Source): You can put this solution on YOUR website!





Replace n! by n*(n-1)*(n-2)! in the first fraction and by n*(n-1)! in the second 







Multiply through by 2 to clear of fractions:











n-8 = 0;  n+5 = 0
  n = 8     n = -5

Ignore negative answer.

Answer:  n = 8

Edwin

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