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

asked Sep 2, 2020 28.6k views

2 votes

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3 votes

Answer:

$\large\boxed{_7P_2=42}$

Explanation:

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

Orazio answered Sep 7, 2020