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How many distinct arrangements are there of USF? How many distinct arrangements are there of BUL 1 L 2 and BULL? How many distinct arrangements

  1. How many distinct arrangements are there of USF?

  1. How many distinct arrangements are there of BUL1L2 and BULL?

  1. How many distinct arrangements are there of R1UN1N2ER2 and RUNNER?

  1. How many distinct arrangements are there of EXERCISE?

  1. How many distinct 3-letter arrangements are there of ABCDEFGH?

  1. How many distinct 3-letter sets are there of ABCDEFGH?[Note that {a, b, c}, {a, c, b}, {b, a, c}, {b, c, a}, {c, a, b}, and {c, b, a} all represent the same set.]

  1. How many distinct r-object arrangements can be selected from n objects? How many distinct r-object sets can be selected from n objects?

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