Question

Evaluate. 7P2 this is premutations and i dont get it

Answer 1

`\large\boxed{_7P_2=42}`

Explanation:

`_nP_k=(n!)/((n-k)!);\ n!=1\cdot2\cdot3\cdot...\cdot n\\\\\text{We have:}\\\\_7P_2=(7!)/((7-2)!)=(7!)/(5!)=(5!\cdot6\cdot7)/(5!)=6\cdot7=42`