C53的计算方法如下:
1. 计算5的阶乘(5!):
$$5! = 5 times 4 times 3 times 2 times 1 = 120$$
2. 计算3的阶乘(3!):
$$3! = 3 times 2 times 1 = 6$$
3. 计算2的阶乘(2!):
$$2! = 2 times 1 = 2$$
4. 将5的阶乘除以3的阶乘和2的阶乘的乘积:
$$C53 = frac{5!}{3! times 2!} = frac{120}{6 times 2} = frac{120}{12} = 10$$
所以,C53的结果是10