Two-Term ratio - compares two quantities measured in the same units.

can also be written as a : b or a to b.

Three-Term ratio - compares three quantities measured in the same units.

can also be written as a : b : c or a to b to c.

part-to-part ratio - compares different parts of a group to each other.

part-to-whole ratio - compares one part of a group to the whole group.

PLEASE COMMENT

what kind of definitions are these?

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