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Mathematics

Grade-8

Easy

Question

Which of the following is a function?

{(0, 1), (1, 2), (2, 3), (2, 4)}
{(0, 2), (1, 3), (4, 3), (1, 2)}
{(1, 3), (1, 2), (2, 0), (3, 4)}
{(1, 2), (2, 2), (3, 2), (4, 2)}

hint Hint:

$F o r space a n space o r d e r e d space p a i r space t o space b e space a space f u n c t i o n comma space bold italic t bold italic h bold italic e bold italic n bold space bold italic n bold italic o bold space bold italic t bold italic w bold italic o bold space bold italic o bold italic u bold italic t bold italic p bold italic u bold italic t bold space bold italic v bold italic a bold italic l bold italic u bold italic e bold space bold italic m bold italic u bold italic s bold italic t bold space bold italic h bold italic a bold italic v bold italic e bold space bold italic t bold italic h bold italic e bold space bold italic s bold italic a bold italic m bold italic e bold space bold italic i bold italic n bold italic p bold italic u bold italic t bold space bold italic v bold italic a bold italic l bold italic u bold italic e$

The correct answer is: {(1, 2), (2, 2), (3, 2), (4, 2)}

For different domain values, different range values are there. {(1, 2), (2, 2), (3, 2), (4, 2)}
A function is a relation which describes that there should be only one output (domain) for each input (range)

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