Can You Solve This Riddle?
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This is a riddle… and I need your help to solve it. Let me explain... I have 12 marbles, 11 of which I know are identical, and one which looks the same, but weighs a slightly different amount. I need to figure out which marble is different. I have a scale I can use to compare groups of marbles, but I can only use it three times. And to make matters worse, I don’t know whether the odd-marble-out weighs more or less than the other marbles. How can I find the different marble? To try figuring it out for yourself, pause the video on the next screen. This is known as the 12-marble problem. And to solve this, let’s start by weighing 4 marbles against 4 marbles, leaving 4 off of the scale. This is our first weigh, and it can go one of two ways: either t...
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This is a riddle… and I need your help to solve it. Let me explain... I have 12 marbles, 11 of which I know are identical, and one which looks the same, but weighs a slightly different amount. I need to figure out which marble is different. I have a scale I can use to compare groups of marbles, but I can only use it three times. And to make matters worse, I don’t know whether the odd-marble-out weighs more or less than the other marbles. How can I find the different marble? To try figuring it out for yourself, pause the video on the next screen. This is known as the 12-marble problem. And to solve this, let’s start by weighing 4 marbles against 4 marbles, leaving 4 off of the scale. This is our first weigh, and it can go one of two ways: either t...
