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[" 3.If "A={1,2,3,...n}" and "B={a,b}" t...

[" 3.If "A={1,2,3,...n}" and "B={a,b}" then the "],[" number of surjections from "A" into "B" is "],[[" (a) "^(n)P_(2)," (b) "^(n)C_(2)," (c) "2^(n)-2," (d) "n^(2)-n]]

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