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Which of the following is not a null set?

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Set of odd natural numbers divisible by 2

{ y : y is a point common to any two parallel lines }

Set of even prime numbers

{ $χ$ : $χ$ is a natural number, $χ$ $<$ 5 and $χ$ $>$ 7 }

answer is B.

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Detailed Solution

There is no odd natural number divisible by 2, so there will be no element in this set, hence it is a null set.

(b) There is only one even prime number which is 2i.e., there is a element, so it is not a null set

(d) Since, parallel lines never intersect each other, so they have no common point i.e., no element, so it is a null set.

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