C-10-Q030mediumsingle_mcqThe general expression for n!n!n! is —an(n+1)(n+2)⋯3⋅2⋅1n(n+1)(n+2)\cdots 3 \cdot 2 \cdot 1n(n+1)(n+2)⋯3⋅2⋅1bn(n−1)(n−2)⋯3⋅2⋅1n(n-1)(n-2)\cdots 3 \cdot 2 \cdot 1n(n−1)(n−2)⋯3⋅2⋅1cn+(n−1)+(n−2)+⋯+1n+(n-1)+(n-2)+\cdots+1n+(n−1)+(n−2)+⋯+1dnnn^nnn