The number of possible passwords is 26^4 * 10^4.
We will make 4 picks from each category (letters and numbers).
We can duplicate them (i.e., pick each character more than once.)
so, for your 4 picks from the letters, you'll have
26 * 26 * 26 * 26 = 26^4 possible selections.
For each of these, you'll have 4 picks from the digits. Similar reasoning, this works out to
10^4 combinations of digits.
This means you'll have 26^4 * 10^4
Possible combinations of 4 letters and 4 digits, and, for each of these, you now need to work out how many unique ways to arrange them.
We will have 8 possible choices for the 1st character, 7 for the second, 6 for the third, etc. This works out to 8!
different orderings for each of your
26^4 * 10^4
The number of possible passwords is 26^4 * 10^4.
Learn more about passwords here: https://brainly.com/question/15016664
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