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[" 8."(^(36)C(r+1))times(k^(2)-3)=^(35)C...

[" 8."(^(36)C_(r+1))times(k^(2)-3)=^(35)C_(r)times6" ,then the number of ordered pairs "(r,k)," where "k in I" ,are "],[[" a."2," b."6],[" c."3," ) "" d."4]]

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