Choose the correct options for the following questions.
$\begin{bmatrix}8\\5 \end{bmatrix}$=
Difficulty: Easy
A:
56
B:
40
C:
63
D:
72
$n^{2}+3n+2$=
Difficulty: Easy
A:
$\frac{n!}{(n-1)!}$
B:
$\frac{(n-1)!}{n!}$
C:
$\frac{(n+2)!}{n!}$
D:
$\frac{(n-2)!}{n!}$
$\frac{n!}{(n-1)!}$=
Difficulty: Easy
A:
n
B:
n!
C:
(n-1)!
D:
0!
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