Hi guys, The question is $\displaystyle 7Pn=42$ from here i changed to $\displaystyle \7!(7-n)!=42$ and crossed multiplied giving me the wrong answer the right answer however is two how do we do these?
Hi guys, The question is $\displaystyle 7Pn=42$ from here i changed to $\displaystyle \7!(7-n)!=42$ and crossed multiplied giving me the wrong answer the right answer however is two how do we do these?
Hi guys, The question is $\displaystyle 7Pn=42$ from here i changed to $\displaystyle \7!(7-n)!=42$ and crossed multiplied giving me the wrong answer the right answer however is two how do we do these?
You might just do it by inspection: $\displaystyle 7\cdot 6=42$. So what is $\displaystyle n=~?$