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[" 23.If "X={8^(n)-7n-1|n in N}" and "Y=...

[" 23.If "X={8^(n)-7n-1|n in N}" and "Y={49n-49|n in N}],[" Then "],[[" (a) "X sub Y," (b) "Y sub X],[" (c) "X=Y," (d) "X nn Y=phi]]

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