CPM Homework Help : A2C Problem 10-66

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10-66.

If $f \left(n\right) = n!$ , evaluate each of the following ratios.

$\frac { f ( 5 ) } { f ( 3 ) }$
Hint (a):
$\frac{5!}{3!}=\frac{5\cdot 4\cdot 3\cdot 2}{3\cdot2}$
Answer (a):
$20$

$\frac { f ( 6 ) } { f ( 4 ) }$
Hint (b):
See part (a).

$\frac { f ( 9 ) } { f ( 7 ) f ( 2 ) }$
Hint (c):
See part (a).
Answer (c):
$36$

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