If A = 1,2,3,4 then which of the following is a function on A ? - Vidyadip

MCQ

If $A =\{1,2,3,4\}$ then which of the following is a function on A ?

A
$f_1=\{(x, y) / y=x+1\}$
B
$f_2=\{(x, y) / x+y=\geq 4\}$
C
$f_3=\{(x, y) / y < x\}$
✓
$f_4=\{(x, y) / x+y=5\}$

✓

Answer

Correct option: D.

$f_4=\{(x, y) / x+y=5\}$

D

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