(3) for σ = {a, b}, construct dfa’s that accept the sets consisting of(a) all strings with at least two a’s,(b) all strings with no more than two a’s(c) all strings with at least one b and exactly two a’s,

browsing like internet search? don't look at anything stupid. or set up restrictions on ur device's search engine. and if something suspicious comes up don't be dumb and click on it. i hope that's what ur question meant.