0
1, 5, 9, 15, ?
1, 5(1+4), 9(5+4), 15(9+6), ?(15+?)
since the addition of 4 is done 2 times, we can say that also will 6
?=15+6
?=21
Wiki User
∙ 13y ago
Chelsea Bauer
21
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What would be the next number in this series 15 12 13 10 11 8?
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