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Full Idea
'Three is two and one' presupposes that collections of objects exist, which while they impress the senses thus, ¶¶¶, may be separated into two parts, thus, ¶¶ ¶. This being granted, we term all such parcels Threes.
Gist of Idea
3=2+1 presupposes collections of objects ('Threes'), which may be divided thus
Source
John Stuart Mill (System of Logic [1843], 2.6.2)
Book Ref
Mill,John Stuart: 'System of Logic (9th ed, 2 vols)' [Longmans, Green etc 1875], p.296
A Reaction
Mill is clearly in trouble here because he sticks to simple arithmetic. He must deal with parcels too big for humans to count, and parcels so big that they could not naturally exist, and that is before you even reach infinite parcels.