8 is the first.
Reasoning:
So we know what the Fibonacci sequence is. To get the next number, you add the number behind it, by the number behind that.
For example, these are the first 5 Fibonacci numbers.
1, 1, 2, 3, 5.
1 + 0 = 1.
So 1 is the second number.
1 + 1 is 2.
So 2 is the third number.
2 + 1 = 3.
So 3 is the fourth number.
3 + 2 = 5.
So 5 is the fourth number.
The problem:
If the fifth term is 49, and the fourth term is 30. We can subtract 49 by 30, to find the third number, and so on.
49 - 30 = 19.
So 19 is the third number.
30 - 19 = 11.
11 is the second.
19 - 11 = 8.
8 is the first.
