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What would be the next number in this series 15 12 13 10 11 8?
The series 1 6 10 13 15 (1+5=6; 6+4=10, 10+3=13; 13+2=15) is completed by 15+1=16. The answer is 16.
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The next number after 15 will be 3. You are sequentially adding 9, adding 1, and dividing by 5.
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