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Which of the relations is not a function?
  • a)
    one many
  • b)
    domain = codomain
  • c)
    many one
  • d)
    one-one
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
Which of the relations is not a function?a)one manyb)domain = codomain...
Example: y = x2
If x = 2, y = 4. 
If x = -2, y = 4. So there you have a many-to-one relation and it is DEFINITELY a function.
Now, a one-to-many relation is NOT a function.
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Most Upvoted Answer
Which of the relations is not a function?a)one manyb)domain = codomain...
One-to-one and many-to-one functions. A function is said to be one-to-one if every y value has exactly one x value mapped onto it, and many-to-one if there are y values that have more than one x value mapped onto them. This graph shows a many-to-one function.
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