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Question
Choose the correct alternative:
Let X = {1, 2, 3, 4}, Y = {a, b, c, d} and f = {(1, a), (4, b), (2, c), (3, d), (2, d)}. Then f is
Options
an one-to-one function
an onto function
a function which is not one-to-one
not a function
Solution
not a function
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