9.6 smart question (2) -- 9-ball weighing, 9.6 smart question ball weighing

9.6 smart question (2) -- 9-ball weighing, 9.6 smart question ball weighing
Question: given 9 balls, eight of them share the same weight and only one is relatively heavy. For a given balance, use up to two times to find the ball.
Answer: 1) divide the nine balls into three groups and weigh them once to determine which ball contains the heavy ball. If the two groups of weights are equal, the Unweighed group contains the ball. 2) select two balls in the group containing the ball, weigh them once, and confirm the ball.

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