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英语专长的来,不仅要有答案,别来打酱油!Therearesixequallyspacedbeadsonacircle.Howmanystraightlinesareneededtoconnecteachbeadwitheveryotherbead?

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英语专长的来,不仅要有答案,别来打酱油!
There are six equally spaced beads on a circle.How many straight lines are needed to connect each bead with every other bead?
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