57
21
The answer is 34. The full sequence is called the Fibonachi series. Your sequence is 3 5 8 13 21 3 + 5= 8 8 + 13 = 21 Therefore: 13 + 21 = 34
Answer = 21 The next number is the previous 2 numbers added together
If you mean: 1 1 2 3 5 8 13 21 then the next number is 13+21 = 34
The next number will be 13+21 = 34
21
24
the answer will be 21
24
24, they are going up in 3's, 13, 16, 19 and 18, 21 so next number is 24.
21
43
21
21
21
21.
21