So i need to estimate the number of possibilities of a 8 characters password all stick together with a specified pattern wish have only:
uppercase letter and numbers. no special characters
The pattern is : Number, Number, Up Letter, Up Letter, Number, Up Letter, Number, Up Letter
I try to understand Combination formula and Probability and combinatorics but i didn't find the solution yet.
I admire the guys or girls who will find the solution because my brain plasticity is probably far less than those who will find it.
There are 10 numbers from 0 to 9 and 26 different (uppercase) letters in the english alphabet. Making a password one will first choose from 10 different numbers and for each of these one can choose from 10 different numbers and so on. The total number of possibilities is:
$10 * 10 * 26 * 26 * 10 * 26 * 10 * 26 = 10^4\cdot 26^4$