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‘All republics are grateful’ and ‘Some republics are not grateful’ cannot both be true, and they cannot both be false. This is called as

  1. contraries
  2. contradictories
  3. subaltern
  4. super altern
in General Aptitude
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  1. Contraries :- Statements that are opposite in meaning. They both can be false at same time but can't be true togather.
  2. Contradictories :- Statements that are opposite in meaning. In this one statement is true if and only if the other is false.
  3. Subaltern :- Asserting only a part of what is asserted in a related statement..
  4. Superaltern :- A statement from wich we can assert a subaltern.

$\therefore$ Option $B.$ is correct.

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