Select the pair which has the same relationship. TEN:DECIMAL

Concept: In a X:Y analogy, Y must name the abstract category that X exemplifies. Here DECIMAL is the name of the positional number system whose base is TEN, so the matching pair must connect a number to the name of the number system that uses that number as its base.

Application: Decimal is the number system with base ten. Binary is the number system with base two, so pairing two:binary mirrors ten:decimal exactly.

Contrast the other options:

• seven:septet - septet names a group of seven items, not a number system.

• four:quartet - quartet names a group of four (e.g., a musical quartet), not a number system.

• five:quince - quince is the Spanish word for fifteen, not five; either way it is not the name of a number system.

Since only two:binary names an actual base-two number system parallel to decimal's base-ten system, it is the pair with the same relationship.