Answer:
-1 1/2
Explanation:
d(4) = 1/12 · (4 - 1) · (-6)
d(4) = 1/12 · 3 · (-6)
d(4) = 3/12 · (-6)
d(4) = 1/4 · (-6)
d(4) = -6/4 or -3/2
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