A certain lottery is won by selecting the correct 4 numbers from 1, 2, …, 30 in the same order that they are drawn. What is the probability of winning?

Question

Permutations rule when some items are identical to others

Answer 1

Since the order makes a difference, this is a permutation:

 

30! / (30 - 4)! possible outcomes

 

The chance is 1 out of that number.