Question

6!
--------- = ?
3! . 2!

Answer 1

6! / 3! * 2! 

6 * 5 *4 * 3! / 3! * 2!

corta 3! com 3!

6 * 5 * 4 / 2!

120 / 2 * 1

60

Answer 2

6.5.4.3.2.1 720 720
--------------- = ---------- = -------- = 60
3.2.1 . 2.1 6.2 12