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>> No.8418205 [View]
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8418205

>>.8418178
I don't know what you mean by "have to". If you recognize something, it helps of course. If you need to rediscover something, it's more work. It might not be necessary though. And there are proof techniques. Like, for such problems, induction. E.g. if you define S(n) to be your sum, does it fulfill some relation.. Trial and error.

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