MUSIC THEORY FUNDAMENTALS - Chapter 7, Exercise 1 Solution
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Building the V Chord in G Major

PROBLEM
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Using the real G major scale (G-A-B-C-D-E-F#-G) from Chapter 3's own
material, build the triad on the 5th scale degree (V) and identify its
quality using semitone counts, per this chapter's own method.

SOLUTION
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The G major scale, numbered by degree:

    1=G, 2=A, 3=B, 4=C, 5=D, 6=E, 7=F#

The 5th scale degree is D. Stack two thirds on top of D, using only
notes from the G major scale:

    D -> F#   (D to F# is 4 semitones = major 3rd)
    F# -> A   (F# to A is 3 semitones = minor 3rd)

So the triad on D (the V chord) is D-F#-A: a major 3rd with a minor 3rd
stacked on top, which per Chapter 5's own triad table is a MAJOR triad.

ANSWER: The V chord in G major is D-F#-A, a major triad.

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WHY THIS WORKS AS AN ANSWER

This confirms the chapter's own fixed I-ii-iii-IV-V-vi-vii° quality
pattern holds in G major exactly as it does in C major - the 5th degree
is major in both keys, since the pattern is a direct, mechanical
consequence of the major scale's own W-W-H-W-W-W-H interval structure
(Chapter 3), which is identical in every major key regardless of which
note it starts on.