Mathematics
         
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Mathematical calculation:
    Enter the mathematical formula directly and click the "Next" button to get the calculation answer.
    It supports mathematical functions (including trigonometric functions).
    Current location:Mathematical operation > History of Mathematical Computation > Answer

    Overview: 1 questions will be solved this time.Among them
           ☆1 arithmetic calculations

[1/1 Formula]
    Work: Calculate the value of equation (A(9,9)+A(9,8)+A(9,7)+A(9,6)+A(9,5)+A(9,4)) .
    Question type: Mathematical calculation
    Solution:
          (A(9,9)+A(9,8)+A(9,7)+A(9,6)+A(9,5)+A(9,4))
        =(362880+A(9,8)+A(9,7)+A(9,6)+A(9,5)+A(9,4))
        =(362880+362880+A(9,7)+A(9,6)+A(9,5)+A(9,4))
        =(362880+362880+181440+A(9,6)+A(9,5)+A(9,4))
        =(362880+362880+181440+60480+A(9,5)+A(9,4))
        =(362880+362880+181440+60480+15120+A(9,4))
        =(362880+362880+181440+60480+15120+3024)
        =985824

    Answer:(A(9,9)+A(9,8)+A(9,7)+A(9,6)+A(9,5)+A(9,4))=985824


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