MCQ
Which of the following is not a function?
- A{(1, 2), (2, 4), (3, 6)}
- B{(-1, 1), (-2, 4), (2, 4)}
- C{(1, 2), (1, 4), (2, 5), (3, 8)}
- D{(1, 1), (2, 2), (3, 3)}
Solution:
A relation from a set A to a set B is said to be a function if every element of set A has one and one image in set B.
In {(1, 2), (1, 4), (2, 5), (3, 8)}, since element 1 has two images 2 and 4 which is not possible in a function so, it is not a function. Rest all have
one and only one image so they can be called a function.
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