I think it would be a minor second. D flat to D double flat would be the equivalent of D flat to C.
Major triads are made up of three notes; a major third interval followed by a minor third interval. An example of the C major triad is C E G. A minor triad has a minor third interval followed by a major third interval, such as C E Flat G.
F# minor is relative to A major, so Gb minor is essentially the same, although they're probably looking for B double flat major or something useless like that.
Every key signature that has flats has a B flat. These keys are: -F Major (Also D Minor and G Dorian) Has only B flat. -B flat Major (Also G Minor and C Dorian) Has B flat and E flat. -E flat Major (Also C Minor and F Dorian) Has B flat, E flat, and A flat. -A flat Major (Also F Minor and B flat Dorian) Has B flat, E flat, A flat, and D flat. -D flat Major (Also B flat Minor and E flat Dorian) Has B flat, E flat, A flat, D flat, and G flat. -G flat Major (Also E flat Minor and A flat Dorian) Has B flat, E flat, A flat, D flat, G flat, and C flat. -C flat Mojor (Also A flat Minor and D flat Dorian) Has B flat, E flat, A flat, D flat, G flat, C flat, and F flat.
The key signature that has B flat, A flat, E flat and D flat is Concert A flat Major.
It depends on what scale you're talking about. B flat major = B flat, C, D, E flat, F, G, A B flat harmonic minor (ascending and descending) = B-flat, C, D-flat, E-flat, F, G-flat, A (natural), B-flat, A (natural), G-flat, F, E-flat, D-flat, C, B-flat B flat melodic minor (ascending and descending) = B-flat, C, D-flat, E-flat, F, G (natural), A (natural), B-flat, B-flat, A-flat, G-flat, F, E-flat, D-flat, C, B-flat B flat natural minor = B-flat, C, D-flat, E-flat, F, G, A, B-flat
A C to a G would be a perfect fifth. Because the interval was decreased by 2 half-steps (by sharping the C and flatting the G), the interval C sharp to G flat is a double-diminished 5th.
the interval is a 3rd.
a
E flat consists of 3 flats, B flat, E flat and A flat. E flat to B flat would be a perfect 5th interval as B flat is in E flat major, but because your question was E flat to B, B is a semitone up from B flat, this would mean the interval becomes a semitone larger, and a semitone larger from a perfect interval is augmented. Therefore, the answer to your question is an augmented 5th. Hope this helps :)
The interval from B-flat to D is a major third, regardless of the key.
Double Interval, MARCH
augmented 5th, as e flat to b flat is a perfect 5th and b is a semitone above b flat, making the interval augmented
Normal interval, close interval, and double interval
The interval from A to Bb is a minor 2nd, also called a half step.
normal interval, close interval, and double interval
Normal interval, close interval, and double interval
Minor 7th