January 2019 1 28 Report
Diketahui koordinat titik P(a, -2, 3) , Q(0, 4, 5) dan R(2, 5, c). jika vektor PQ tegak lurus dengan vektor QR, hasil a - c = ....
A. -4
B. -2
C. 2
D. 4
E. %
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