Math Olympiad for Middle School | 2010 | Division M | Contest 2 | MOEMS | 2D

2D The first three terms in a sequence are: 1, 2, 3. Each term after that is the opposite of the sum of the three previous terms. For example, the 4th term is -6 (the opposite of 1+2+3), and the 5th term is 1. What is the 99th term?

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