Prove inequality 3 ^ n > (n + 1)!

Prove inequality 3 ^ n > (n + 1)!

This inequality is not true at all
On the left is the multiplication of N 3, on the right is (n + 1) n (n-1) 2*1,
When n > = 4, the left

Prove inequality 1 / 3 + 1 / 5 + +1/2n+1

Decompose the right form into ln (2 / 1) + ln (3 / 2) +. Ln (n + 1 / N), (change √ to 1 / 2, and then turn to the left form)
Compared with each other, the strengthening proposition is: 2 / 2n + 1

According to what is natural number divided into odd number and even number?

Natural number can be divided into odd number and even number according to whether it can be divided into 2 integers