is 2-pentanone,3-pentanone,a metamer or position isomer?give answer with reasoning?

Question

from topic isomerism

Answer 1

It would be a Positional Isomer because the oxygen atom's double covalent bond is attached to different carbon atoms in both but technically it would also be a metamer as the word "metamer" is just the obsolete term for Isomer, so technically it is both although the term positional Isomer is more specific

Answer 2

Actually metamerism has nowadays the same meaning as isomerism.
Formerly the term isomerism was used also for compounds having the same percentage chemical composition, even if the number of atoms in a molecule differed(http://dictionary.laborlawtalk.com/isomeric)

So 2-pentanone and 3-pentanone are positional isomers according to the current terminology and metamers with the old.
Where did you get that question/term from?