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Which of the following are examples of ...

Which of the following are examples of null set?
(i) A={x:x is a vowel in English alphabet }
(ii) `B = {x:x is an even number, 2lt xlt 4}`
(iii) `C ={x: x in W } `

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(i) A is null set
(ii) B is null set
(iii) C is not a null set
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