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[" 55) If "X={8^(n)-7n-1,n in N}" and "]...

[" 55) If "X={8^(n)-7n-1,n in N}" and "],[{49n-49,n in N}." Then "],[" In "X sub Y],[" B) "Y sub X],[" C) "X nn Y=phi],[" D) "X=Y]

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