Mathematics, 16.04.2021 06:30, codeyhatch142

A number of children are posing for a group picture. There are five 8-year-olds and four 9-year-olds posing in the picture.
How many arrangements are possible where the 8-year-olds and 9-year-olds alternate in the lineup?

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A number of children are posing for a group picture. There are five 8-year-olds and four 9-year-olds...