Question

Which of the following is not a function?
ans.
{(1,2), (2,4), (3,6)}
{(1,2), (1,4), (2,5), (3,8)}
{(1,1), (2,2), (3,3)}
{(-1,1), (-2,4), (2,4)}​

Answer 1

Answer:

{(1,2), (1,4), (2,5), (3,8)}

Step-by-step explanation:

Hope it's helpful

Answer 2

Answer:

{(1,2), (1,4), (2,5), (3,8)}    is not a function.

Step-by-step explanation:

A  function  is  a  relation  in  which  every  x value  is  associated  with exactly one y value.

             That means  no  two  pairs  have  the  same  first  element  and  different  second  elements.

 {(1,2) , (2,4) , (3,6)}    ,  {(1,1) , (2,2) , (3,3)}  and  {(-1,1) , (-2,4) , (2,4)}   is  a  function.

because  it  has  different  first  elements and different  second  elements.

        but  {(1,2) , (1,4) ,(2,5) , (3,8)}  is  not  a  function.  Because  first elements   is  same  in  the  points  (1,2)  and  (1,4).

        so  {(1,2) , (1,4) , (2,5) , (3,8)  is not a function.