Question: For a positive integer n , evaluate the sum ( [ n ] , [ n ] ) 7 n + ( [ n ]

For a positive integer n, evaluate the sum
([n],[n])7n+([n],[n-1])7n-1+([n],[n-2])7n-2+cdots+([n],[2])72
 For a positive integer n, evaluate the sum ([n],[n])7n+([n],[n-1])7n-1+([n],[n-2])7n-2+cdots+([n],[2])72

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