Fuzzy sets 42

0. Let A = (2,4,7) and B=(4,5,6) be triangular fuzzy numbers, ∩d, ∪d denote drastic intersection and union respectively. Then which of the following statements is/are correct?
1. A ∩d B is not normal
2. A ∪d B is not normal
3. A ∩d B is a fuzzy number
4. A ∪d B is a fuzzy number

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