The quantity two (2) is the 2nd favourable integer and the first key selection. It can be even, which is the only real even prime (the primes aside from two are known as the odd primes). The amount 2 is usually equivalent to its factorial since . 知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。 https://kevinz538uro3.hamachiwiki.com/user