The fact family of of the equation 12/N = 60 is: 12 = 60 N N = 0.2
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The answer is 10. The series is formed as 60 / n, where n is the position in the series. Each successive number is then formed by increasing the denominator by 1 at every step. 60 / 1 = 60; 60 / 2 = 30; 60 / 3 = 20; 60 / 4 = 15; 60 / 5 = 12; 60 / 6 = 10.
5
2n(n+1)
An = 2(n - 1)2 + 2(n - 1) = 2n(n - 1)
0.3333