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Mathematics, 29.08.2019 14:30 lalllda
Nine people (ann, ben, cal, dom, ed, fran, gail, hal and ida are in a room. five of them stand in a row for a picture. in how many ways can this be done if hal or ida are in the picture, but not both?
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Nine people (ann, ben, cal, dom, ed, fran, gail, hal and ida are in a room. five of them stand in a...
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