Question: After Harry gets Slughorn's memory, he watches it with Dumbledore. Dumbledore says "This is beyond anything I imagined" after the viewing. But then he goes on to say that he's been hunting for the horcruxes. I don't understand his remark when he's been finding and destroying them, since he must know what they are. How else can you look for something if you don't know what it is? (01:50:20)
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Chosen answer: Dumbledore did not know that Tom Riddle was planning to create seven Horcruxes, which was more than he expected.
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