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The rule is {x : x = 2*n where n is any integer.}
rule = regulation
Each number is -4 times the previous one. That means that you can write a recursive rule as: f(1) = -3 f(n) = -4 * f(n-1) The explicit rule involves powers of -4; you can write it as: f(n) = -3 * (-4)^(n-1)
Sn = n^2
295 the rule is: f(n+1) = 2f(n) - n