In problems, the nature of the problem and the information needed to solve it are clear. In problems, either or both the nature of the problem and the information required to solve it are unclear

Well-defined , ill-defined

Explanation:

Well defined problem are the problem that have specifically defined path for solution,certain goal, clear problem solving method etc.Nature is clearly defined for such problem.

Ill-defined problems are the problem that does not have specific and clear problem terms that creates issue in finding solution and path.Clarity is not present in the information related with problem or nature is not defined properly.

to stay where they were until m sent for