You can put this solution on YOUR website! for the first character ask your self
how many letters are there?
second character
how many letters are there?
how many letters can there be in the second position?
so it would be the first character amount times the second character amount.
how many digits are there?
that many times the total last amount.
can digits be repeated? then the last total time that number and
The final character same number of diigtis time the last product
so the main questions to ask in place are
how many characters (letters and digits) of this type are there?
and how many are allowed?
multiply that by the last product.