Geometry: Common Core (15th Edition)

Multiply by 1 plus the previous integer used in multiplication to get the next term. $\underset{\times2}{\underset\Rightarrow{1}}, \underset{\times3}{\underset\Rightarrow{2}},\underset{\times4}{\underset\Rightarrow{6}}, \underset{\times5}{\underset\Rightarrow{24}},\underset{\times6}{\underset\Rightarrow{120}},\underset{\times7}{\underset\Rightarrow{720}}, 5040$, . . .