Question

Question:
Find the next number in the sequence: 1, 1, 2, -1, 1, -2, -1,

Answer 1

Answer: Next number in sequence is - 1

Explanation:

1 + 1 = 2

1 - 2 = - 1

2 + (-1) = 1

-1 - 1 = - 2

1 + (-2) = - 1

-2 - (-1) = - 1

The sequence is to subtract then add, and so on