Convert the following products into factorials :

(n + 1)(n + 2) (n + 3) …(2n)

Convert the following products into factorials :

5 ⋅ 6 ⋅ 7 ⋅ 8 ⋅ 9 ⋅ 10

Convert the following products into factorials :

3 ⋅ 6 ⋅ 9 ⋅ 12 ⋅ 15 ⋅ 18

Convert the following products into factorials :

1 ⋅ 3 ⋅ 5 ⋅ 7 ⋅ 9 …(2n – 1)

Which of the following are true :

(2 + 3)! = 2! + 3!