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Mathematics 19 Online
OpenStudy (anonymous):

Mr and Mrs Smith have invited 9 of their friends and their spouses for a party at the Wakiki Beach Resort. They stand for a group photograph. If Mr Smith never stands next to Mrs Smith(as he says they are always together otherwise), how many ways the group can be arranged in a row for the photograph? a.20! b.19!+18! c. 18*19! d.2*19!

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