Hello Baruch. The "7" indicates there is a note a seventh above the root present. The V Chord is D F# A for example... D is the root... F# is the 3rd... A is the 5th... when V7 is notated, C is the 7th. This 7th adds a bluesy sound to the chord (it's the signature chord tone of the blues). You can learn more about chords in Music Theory Study 3 (of course make sure to study 1 and 2 first).
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Hello Baruch. The "7" indicates there is a note a seventh above the root present. The V Chord is D F# A for example... D is the root... F# is the 3rd... A is the 5th... when V7 is notated, C is the 7th. This 7th adds a bluesy sound to the chord (it's the signature chord tone of the blues). You can learn more about chords in Music Theory Study 3 (of course make sure to study 1 and 2 first).