Question 9

Level pending

Find the value of the expression.

7P2=?

note: nPr represents the number of permutations of n objects arranged r at a time.

Use the formula shown below to evaluate 7P2.

nP2= n ! ( n r ) ! \frac{n!}{(n-r)!}


The answer is 42.

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1 solution

Luye Xue
Feb 24, 2015

nP2= n ! ( n r ) ! \frac{n!}{(n-r)!}

7P2= 7 ! 5 ! \frac{7!}{5!}

7P2= 42

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