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[" (2"x^(2)+3x+4)^(10)=sum(r=0)^(20)a(r)...

[" (2"x^(2)+3x+4)^(10)=sum_(r=0)^(20)a_(r)x^(r)],[" Your Answer "]," then the value of "(a_(7))/(a_(13))" is "

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