Which of the following relations are functions? Give reasons.
(i) {(2,1), (5,1), (8,1), (11,1), (14,1), (17,1)}
(ii) {(2,1), (4,2), (6,3), (8,4), (10,5), (12,6), (14,7)}

The correct answer is: {1}

(i) We have given the data
As {(2,1), (5,1), (8,1), (11,1), (14,1), (17,1)}
Domain:-  { 2 , 5, 8, 11, 14, 17}
Co- Domain:- {1}
From the given data we can analyse that each element in the domain input set has exactly one output.
Therefore, the given data is a function.

All functions are relations but all relations are not functions.