Please answer parts b, d and e using the appropriate notations

Please keep it readable

Thanks

17. Write regular expressions for the following languages on 10 (a) all strings ending in0 (b) all strings not ending in 01 (c) all strings containing an even number of O's, (d) all strings having at least two occurrences of the substring 00. (Note that with the usual interpretation of a substring, 000 contains two such occurrences), (e) all strings with at most two occurrences of the substring 00, *( al strings not containing the substring 101