Which of the following collections is not a set ?
(i) The collection of natural numbers between 2 and 20
(ii) The collectihon of numbers which satisfy the equation x 2 –5x + 6 = 0
(iii) The collection of prime numbers between 1 and 100.
(iv) The collection of all intelligent women in Jalandhar.
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(iv)
Sol. Collection of all beautiful women in Jalandhar is not a set as it is not a well defined collection. It is not possible to decide logically which woman is to be included in the collection and which is not to be included.
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