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प्रश्न
In set-builder method the null set is represented by
विकल्प
(a) { }
(b) Φ
(c) \[\left| x : x \neq x \right|\]
(d) \[\left| x : x = x \right|\]
उत्तर
(c) \[\left\{ x: x \neq x \right\}\]
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