Such a key only exists in theory. C major has zero flats. C-flat major has 7 flats. C-double-flat major would have 14 flats.
Two flats, B flat and E flat
There are two flats, B flat and E flat. It is the relative minor for B flat Major.
3. Those are Bb, Eb, and Ab.
One, Bb. 1, the flat is B flat.
It varies by key, just like with major keys. There can be as few as one flat (D minor) or all seven flats (A-flat minor). Minor keys can have sharps too.
Cb major has all 7 flats
There are no flats in D major, but there are 2 sharps. C sharp and F sharp.
The key of A-flat major contains four flats: B, E, A, and D.
Three
zero
There are no sharps or flats in C Major.
Two flats, B flat and E flat
7
E Flat Major has 3 G Flat Major has 6
There are two flats in the key of B flat major: B flat and E flat.
There are two flats, B flat and E flat. It is the relative minor for B flat Major.
The key of E-flat major contains three flats: Bb, Eb, and Ab.