4 5 6 7 8 9 10 11 12 13....
It is increasing by one between each number
(This could be wrong......It could be a trick!)
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1+1=2 : 1+2=3 : 2+3=5 : 3+5=8Therefore the next number is 8
456789
21
12110 0r 1210
3,5,8,13 is followed by 21. 1,1,2,3,5,8,13,21,34,55,... is the Fibonacci series or Fibonacci sequence where the next number in the sequence is the sum of the last two numbers (1+1=2, 1+2=3, 2+3=5, etc.)