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Materi : kekuatan interaksirumus :
Iab = Pa . Pb / (Dab)^2
Iab = 30.000 . 10.000 / (100)^2
Iab = 300.000.000 / 10.000
Iab = 30.000
jdi kekuatan interaksi antara kota A dan B adalah 30.000