Question: How many length 5 strings over L = {a,b} cxist? How many length-5 ternary strings (i.c., strings over a set whose cardinality is 3) exist?

How many length 5 strings over L = {a,b} cxist? How many length-5 ternary strings (i.c., strings over a set whose cardinality is 3) exist? How many length 5 strings over = {a,b,c,...,4,2} exist
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