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3 The series is obtained by subtracting a number that reduces by 1 at each stage 18 - 5 = 13 13 - 4 = 9 9 - 3 = 6 6 - 2 = 4 4 - 1 = 3
9 sections
4/9 of 9 = 4
-5
nine out of four can either be a fraction 9/4 or 9:4, or 9 to 4