Mathematics, 27.09.2019 09:30 adrian08022
Alan, beatriz, dora and erick met at a party and shook hands exactly once with everyone they already knew. alan shook hands once, beatriz shook hands twice, clara shook hands three times and dora shook hands four times. how many times did erick shake hand?
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Alan, beatriz, dora and erick met at a party and shook hands exactly once with everyone they already...
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