Question

7.
Which of the following sets are null sets ?
(1) A= {x:x< 1 and x > 3 }
(ii) B= { x:x=9 and 3x = 7 }
(iii) C = {x:x? - 1 = 0, xeZ}
(iv) D={x:x is an even prime number}​

Answer 1

(iv) is null set

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Answer 2

Answer:

B={ x:x=9 and 3x = 7}

Explanation:

This is null set because

in 3x = 7, x is not equal to 9

So there are no elements in this set.

Therefore, it is a null set.