Question: Find (1) an NFA and (2) a regular expression for the following languages on {a,b) . L = {w : na(w)-nb(w) (mod 3) = 0}

Find (1) an NFA and (2) a regular expression for the following languages on {a,b) . L = {w : na(w)-nb(w) (mod 3) = 0} . L = {w : 2na(w) + 3n6(w) is even). Note: na(w) means the number of a's in the string w, and n is defined in the same was
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