C# major
A# minor
D major has a key signature of F sharp and C sharp D minor has a key signature of B flat
There is no key signature that has Bb and C#.
No key signature has two of the same flat or sharp.
C# Major
The key signature with 7 sharps is C-sharp major. In this key, the sharps are F-sharp, C-sharp, G-sharp, D-sharp, A-sharp, E-sharp, and B-sharp. Its relative minor is A-sharp minor, which also features the same key signature.
Only "B flat" is the key signature, then "C sharp" is the accidental.
The key signature of D sharp major has nine sharps: F, C, G, D, A, E, B, and F.
B Major is the 1st major scale that CONTAINS A sharp and F sharp within its key signature but has a total of 5 sharps which are, F# C# G# D# A# F# Major also CONTAINS A sharp and F sharp within its key signature but has a total of 6 sharps which are, F# C# G# D# A# E# C# Major also CONTAINS A sharp and F sharp within its key signature but has a total of 7 sharps which are, F# C# G# D# A# E# B#
Key of F#, key of B, key of E, key of A, key of D, and key of G
A sharp key signature is one that contains sharps.
D minor - more specifically, D harmonic minor (the version of the minor scale with a flat 6 and a sharp 7). However, you will never see a key signature with a B flat and a C sharp. The key signature will only contain B flat.
The key signature that includes the note E sharp is the key of F sharp major.