Evaluate $\frac{n!}{(n-r)!}$; when $n=9, r=5$
Answer & explanation
Correct answer: option 3
$\frac{n!}{(n-r)!}$; when $n=9, r=5$
$\frac{9!}{(9 - 5)!}$
= $\frac{9 × 8 ×7 ×6 ×5 ×4! }{4!}$
= 15120
The correct answer is option (3) : 15120
Evaluate $\frac{n!}{(n-r)!}$; when $n=9, r=5$
Correct answer: option 3
$\frac{n!}{(n-r)!}$; when $n=9, r=5$
$\frac{9!}{(9 - 5)!}$
= $\frac{9 × 8 ×7 ×6 ×5 ×4! }{4!}$
= 15120
The correct answer is option (3) : 15120