65
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
1 13 is a prime number.
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
It is: 1 and 13/15
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
The series alternates between two sequences: one that increases by 1 (11, 12, 13, 14) and another that increases by 1 as well but starts from 2 (2, 3, 4). Following this pattern, the next number in the increasing sequence would be 15, and the next number in the second sequence would be 5. Therefore, the next numbers in the series would be 15 and 5.