One out of 9 otherwise identical balls is overweight. How can it be identified after 2 weighings?

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What has no beginning, no end, and nothing in the middle?

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Being able to interpret the letters on this screen proves that you have this quality.

I am a type of weapon for SCIFI characters. What am I?

What is the equivalent of 4k + 2k +k ?

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One out of 9 otherwise identical balls is overweight. How can it be identified after 2 weighings?

Answer: Weigh a group of 3 balls against another group of 3, then you'll know which group of 3 contains the heavy ball. Pick 2 balls from that group and weigh one against the other.

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