After 13, it's 18.
The next number in the sequence is 18. It's +1, +2, +3, +4, ....
18
Tn = 1 + 3n
Dart Board
After 13, it's 18.
18
18
18
18
18 is the answer and here is why:- 3+1=4 4+2=6 6+3=9 9+4=13 13+5=18
18. The pattern is 3+1=4, 4+2=6, 6+3=9, 9+4=13, so 13+5=18
The next number in the sequence is 18. It's +1, +2, +3, +4, ....
18
18
18
The nest number in the sequence is 18. Note that the difference between each number and the next number in the sequence follows the simple sequence of 1,2,3,4. Obviously the next in the sequence of increases is 5, so 13+5=18.