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Suppose there are 22 tiles in a bag, and that the tiles are labeled with the...

Suppose there are 22 tiles in a bag, and that the tiles are labeled with the numbers 1 to
22. Count the number of selections I can make obeying each set of retrictions:
(a) Unordered selections of 8 of the tiles and the tiles can not be reused.
(b) Unordered selections of 8 of the tiles and the tiles can be reused.
(c) Ordered selections of 8 of the tiles and the tiles can not be reused.
(d) Ordered selections of 8 of the tiles and the tiles can be reused

Math   Statistics-And-Probability   
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