To explain: Each of the correspondences pictured is not a one-to-one mapping from set A to set B.
Answer to Problem 1CE
None of the picture is one-to-one mapping.
Explanation of Solution
Given information:
A mapping from set A to set B is called a one-to-one mapping if every member of set B has exactly one pre image in set A.
In picture a, two elements in set B have single pre image in set A.
In picture b, one element is vacant; it means no pre image in set A.
In picture c, there are in single element in set B has two pre image in set A.
In picture d, in set A, there is no any image in set B.
Therefore, it is clear that it in all four cases this
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