Please show work

QUESTION 4 For the language L = {acmin >= 0. m >0 }, which one of the following strings is not a part of the language ? ab acb accccc accccccccccccb QUESTION 5 Which of the following languages is the product {ab In >=0}{ch In >=0} {abcn in >= 0) {abch in >= 0; {abchin >= 0. m >=0} {abcn >= 0, m >=0} QUESTION 6 If L = {bb), which of the following strings is not a part of L* ? bb bbb bbbbbb