12 balls weigh 3 times to find one fake ball. All balls look alike and given only one mechanical balance with no weights. Time to solve 40 minutes.
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This year would surely bring new lights in your life. Happy new year to you all the time.
How best to divide and conquer
9 balls 1 different weight puzzle: Find the fake ball in 3 weighs. All balls look alike. You are given a pan balance with no weights. Time to solve 30 mins.