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'All the mangoes in the basket are good.'

If the above statement is false, then which one of the following statements is necessarily true?

  1. All the mangoes in the basket are not good.
  2. No mango in the basket is good.
  3. In the basket, some of the mangoes are good and some are not good.
  4. There exists at least one mango in the basket that is not good.

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This question is based on the  concept of  universal quantifier and  existential quantifier in Discrete Math

contradiction of given statement is  Option D

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