Purebred dogs are first assigned the same litter number until they are individually registered with a name. Then the dogs will be assigned a unique registration number with a dog registry. Many people choose to have a microchip implanted in the dog so that it can be read to immediately find the dog's owner.

Which of the following relations is not a function?

(registration number, litter number)
(microchip number, registration number)
(litter number, microchip number)
(microchip number, litter number)
WILL FAN AND MEDAL

Question

Purebred dogs are first assigned the same litter number until they are individually registered with a name. Then the dogs will be assigned a unique registration number with a dog registry. Many people choose to have a microchip implanted in the dog so that it can be read to immediately find the dog's owner.

Which of the following relations is not a function?

(registration number, litter number)
 (microchip number, registration number)
 (litter number, microchip number)
 (microchip number, litter number)
WILL FAN AND MEDAL

safyousuff97 · Answer

will fan and medal

anonymous · Answer

All of these mappings are relations, but 
(litter number, microchip number) 
is not a function, because the same litter number can be assigned to multiple dogs with different microchip numbers. 

The other three relations are also functions, because a registration number or microchip number can only be mapped to one litter number, and a microchip number can only be mapped to one registration number

safyousuff97 · Answer

Thank u for explaining how u got the answer