Four basic steps in solving a problem Sorry, but you're not allowed to access this unit. Have you completed this unit? Then mark this unit as completed. Mark as Completed « Previous Unit 3 Comments sanjeev kumar tyagi on October 23, 2019 at 4:20 PM VERY LUCID AND NICE COURSE Reply cheangeles on April 12, 2020 at 9:04 AM I agree! Reply RODRIGUES MURONDA on April 30, 2020 at 11:48 PM Optimum Reply Give a feedback to your colleague and teacher :-) Cancel replyYour email address will not be published. Required fields are marked *Comment * Name * Email * Website Save my name, email, and website in this browser for the next time I comment.