This seems like a pretty straightforward question but I feel like I'm missing something.
Suppose I wanted to construct a pin number that contains 4 letters of the alphabet and 3 numbers (0 to 9) in no particular order, and I can use the same letter/number more than once.
My pin will be 7 letters/numbers in length.
= 456 976 000
It feels like I'm missing something or is the question really this straightforward?
Any help is appreciated!