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.
23
The next number after 15 will be 3. You are sequentially adding 9, adding 1, and dividing by 5.
18
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.
23
39
Hold a minute till I look at my dartboard...
If you mean: 1 1 2 3 5 8 13 21 then the next number is 13+21 = 34
1 and 2/13
If you mean: 1 2 3 5 8 13 then the next number is 8+13 = 21
2,3,5,7,9,11,and 13
it is but also with a partial number such as (example) 1 and 8/10 or 15 and 13/15
The next number is -21
1 2 3 4 .12 & .13 & .15 & .18 & .22