engineering intelligence MCQ #265

You have 9 balls, one of which is slightly heavier or lighter. How many times do you need to weigh them to find the heavier or lighter one?

engineering intelligence MCQ #265

  1. Question 1

    Q1. You have 9 balls, one of which is slightly heavier or lighter. How many times do you need to weigh them to find the heavier or lighter one?

    • A) 2
    • B) 3
    • C) 4
    • D) 5

    Answer: 3

    Explanation: Divide the balls into 3 groups: 3, 3, and 3. Weigh 3 against 3. If balanced, the different ball is in the remaining 3. Weigh 1 against 1 from the group of 3. If still balanced, the remaining is the different one.