Study the passage carefully and answer the following questions.     Whatever the problem, someone can always oversimplify it. Sometimes a problem is simpler than it seems at first sight, and a cool mind can point to an easy answer. More often though, the simple answers don’t really meet the case. A great scientist of an earlier day, Sir Arthur Eddington, once said that we often think that when we have completed our study of one, we know all about two, because “two is one and one”. We forget that we still have to make a study of “and”.     There’s an important point here, an...