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Mr. Dubey • 89.33K Points
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Q. Consider the set N* of finite sequences of natural numbers with a denoting that sequence a is a prefix of sequence b. Then, which of the following is true?

(A) every non-empty subset of has a greatest lower bound
(B) it is uncountable
(C) every non-empty finite subset of has a least upper bound
(D) every non-empty subset of has a least upper bound
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