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Answer : 4 8 Explanation : Answer: D) 8 Explanation: Suppose there are 9 balls Let us give name to each ball B1 B2 B3 B4 B5 B6 B7 B8 B9 Now we will divide all the balls into 3 groups. Group1 - B1 B2 B3 Group2 - B4 B5 B6 Group3 - B7 B8 B9 Step1 - Now weigh any two groups. Let