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Which of the following sets are null set...

Which of the following sets are null sets. (i) The set 'A' of all prime númbers lying between 15 and 19.
(ii) 'A= `{x: x lt 5, x gt 6'}``
(iii) 'A=`{x: x^2=16, x in N'}``
(iv) 'A={x: |x|<-4, x in N}'

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V PUBLICATION-SETS-QUESTION BANK
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