You have 8 balls, and one will be slightly heavier or lighter than the others. How many times do you need to weigh the balls to find the heavier or lighter one?
Q1. You have 8 balls, and one will be slightly heavier or lighter than the others. How many times do you need to weigh the balls to find the heavier or lighter one?
Answer: 3
Explanation: Divide the balls into 3 groups: 3, 3, and 2. Weigh the two groups of 3. If one is heavier, take that group and weigh 1 against 1. If balanced, the remaining is the heavier or lighter one.