regular expression describe the language { w belongs to {a,b}* : na(w)=3k for k>=0}
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which of the following regular expression describe the language { w belongs to {a,b}* : na(w)=3k for k>=0}
a is wriiten on the base of n like log 10 base a??
options a) (aaa+b)*
option b) (b+a+b+a+b+a+b)*
option c) ((aaa)* + b*ab*ab*ab*)*
option d) (aaa+b+aaab+aaba+abaa+baaa)*
please explain
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