Here's the question you clicked on:
mameadows
how many 5 digit zip codes are possible? Assume all zip codes are possible
use combinations of 10c5- 9c4
There are 10 possible digits (0, 1, 2... 8, 9) So, for each spot, there are 10 possibilities, and there are 5 spots. So, we have 10⁵ = 100000
there are 10 digits possible in each position of the code so its 10 x 10 x 10 x 10 x 10 this is the fundamental theorem of counting
thank you... I was making it so much harder!