Answer:
The next number in the sequence is -2.
Here's how to find it:
- Start with the first two numbers: 1 and 1.
- Add them together to get 2.
- The third number in the sequence is 2.
- Add the second and third numbers together to get 1.
- The fourth number in the sequence is 1.
- Subtract the third and fourth numbers to get -3.
- The fifth number in the sequence is -3.
- Add the fourth and fifth numbers to get -2.
- The sixth number in the sequence is -2.
- Subtract the fifth and sixth numbers to get -1.
- The seventh number in the sequence is -1.
- Add the sixth and seventh numbers to get -3.
- The eighth number in the sequence is -3.
- Subtract the seventh and eighth numbers to get 2.
- The ninth number in the sequence is 2.
- Add the eighth and ninth numbers to get -1.
- The tenth number in the sequence is -1.
- Subtract the ninth and tenth numbers to get -3.
- The eleventh number in the sequence is -3.
- Add the tenth and eleventh numbers to get -4.
- Therefore, the next number in the sequence is -4.