A and C-sharp.
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7 different notes.
In a major scale, these 3rd, 5th, and 7th steps are equal to a major third, a perfect fifth, and a major seventh, respectively. If you were to lower these (by half a step, or one semitone), you would get a minor third, a diminished fifth, and a minor seventh, respectively.
That is an interesting question, the reason is because the scale starts on the note C and uses the interval of a major third, and it just so happens that no black notes are needed to make the scale sound good.
A, B, C#, D, E, F#, and G# are the notes of the A major scale.
A major scale has 8 notes, including the second use of the tonic.