how many combinations can I get from two consecutive four letter password

Question

Let's say I have to enter four-letter password, then I need to enter another foru-letter password. How many different combinations is possible.

 

Thanks alot in advance :)

Answer 1

Assuming that repetitions (AABB) are allowed.

 

First four: 26 · 25 · 24 · 23 = 358800

Second four: 26 · 25 · 24 · 23 = 358800

 

For both permutations 128,737,440,000