Mathematics, 18.02.2020 02:11 cooboy
Fred and Frank play a game. Fred picks an even number X and asks Frank to add all even numbers between 0 and X (inclusive) as fast as possible. After some rounds Frank found a quick way to do it. He simply multiplies X/2 by (X/2 + 1). Explain why it always works.
Answers: 3
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Fred and Frank play a game. Fred picks an even number X and asks Frank to add all even numbers betwe...
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