1. How many three-digit numbers are there in our system of counting numbers? 2. Counting numbers are to be formed using only the digits 3, 4, 5, and 8. Determine the number of possibilities for the
following:
A. two-digit numbers
B. odd three-digit numbers
C. five-digit numbers beginning and ending with 3 and with unlimited repetitions allowed

This is what i found “an explicit formula designates the nth term of the sequence, as an expression of n (where n = the term's location). it defines the sequence as a formula in terms of n. this example is an arithmetic sequence(the same number, 5, is added to each term to get to the next term).” i hope this you for what your looking for. can you plz mark me brainliest?