Teresa has 4 flower pots in 4 different signs. she likes to display her pots in different ways on her window sill. how many ways can she display the pots?

Please pay attention to the following details: She has 4 spots available. The first spot can be filled by any of the 4 pots, so there are 4 possibilities for first place. Now, the second place can be filled with any one of the 3 remaining pots. The second-last and last places can be filled by 2 and 1 pot respectively. The total number of ways is 4 x 3 x 2 x 1 
when yu do the calculations the result is 24. Hope it helped