In the diagram below, the angle alpha is 50 degrees and the angle beta is 155 degrees. Which of the following statements must be true in order for the particle at the center to not accelerate under the influence of forces F1, F2, and F3?

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In the diagram below, the angle alpha is 50 degrees and the angle beta is 155 degrees. Which of the following statements must be true in order for the particle at the center to not accelerate under the influence of forces F1, F2, and F3?<br/><br/><br><img src='https://www.fatskills.com/images2/GradExams/08348B13-EE7F-4448-9583-C188A7503F11.png' height='343' width='621'/>