Total possible number of combinations of ABCD?

e.g. AAAA, AAAB, AAAC, AAAD, AABA, AACA, AADA, DDDA, DDDB etc And if I expanded this to all possible combinations of ABCDE, what would the total number be then? Math isn't exactly my specialty. I built a virtual slot machine in a video game and want to know it's odds. Thanks heaps in advance for the help :) show more e.g. AAAA, AAAB, AAAC, AAAD, AABA, AACA, AADA, DDDA, DDDB etc

And if I expanded this to all possible combinations of ABCDE, what would the total number be then?

Math isn't exactly my specialty. I built a virtual slot machine in a video game and want to know it's odds. Thanks heaps in advance for the help :)
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