Short questions

Suppose when using the Binomial Theorem an Suppose there is a race between 8 friends. expansion simplified to the expression shown below Find the probability that Hye is first, Spyro is 243 x3 + 810 x4 y + 1080x3 y2 + 720x2 y3 + 240xy* + 32ys second and Angelica is last? What was the original question that was expanded? Express your answer in the form (a + b)" and explain your steps