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What is the rule in-7 out-15 in-8 out-18 in-9 out-21 in-15 out-39?
Wiki User
∙ 10y ago
As the ins are increasing by 1, the outs are increasing by 3.
7 Double + 1 = 15
8 Double + 2 = 18
9 Double + 3 = 21
10
11
12
13
14
15 Double + 9 = 39
Wiki User
∙ 10y ago
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