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املأ الفراغ
n!(n−2)!\frac{n!}{\left(n-2\right)!}(n−2)!n!
n
n(n-1)
n(n-1)!
بسّط
4!1!\frac{4!}{1!}1!4!
20
4!
15
4!3!\frac{4!}{3!}3!4!
4
n!(n−1)!\frac{n!}{\left(n-1\right)!}(n−1)!n!
1
-1
4!0!\frac{4!}{0!}0!4!
n!(n)!\frac{n!}{\left(n\right)!}(n)!n!
4!2!\frac{4!}{2!}2!4!
12
8
7!5!2!\frac{7!}{5!2!}5!2!7!
21
65
7!3!4!\frac{7!}{3!4!}3!4!7!
35
n!n(n−1)!\frac{n!}{n\left(n-1\right)!}n(n−1)!n!
إنتهى الإختبار.