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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(9,4)+A(9,5)+A(9,6)+A(9,7)+A(9,8)+A(9,9) .
    Question type: Mathematical calculation
    Solution:
          A(9,4)+A(9,5)+A(9,6)+A(9,7)+A(9,8)+A(9,9)
        =3024+A(9,5)+A(9,6)+A(9,7)+A(9,8)+A(9,9)
        =3024+15120+A(9,6)+A(9,7)+A(9,8)+A(9,9)
        =3024+15120+60480+A(9,7)+A(9,8)+A(9,9)
        =3024+15120+60480+181440+A(9,8)+A(9,9)
        =3024+15120+60480+181440+362880+A(9,9)
        =3024+15120+60480+181440+362880+362880
        =18144+60480+181440+362880+362880
        =78624+181440+362880+362880
        =260064+362880+362880
        =622944+362880
        =985824

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


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