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13/18 = 65/90
12/15 = 72/90 13/15 = 78/90, 15/18 = 75/90 berarti a, b, dan c salah
11/15 = 726/990
13/18 = 715/990
24/33 = 720/990
maka yg terletak diantara dua bilangan tsb adalah d.24/33
semoga membantu :)