Among the following propositions two are related in such a way that they cannot both be true but can both be false . Select the code that states those propositions.(A) Every student is attentive(B) Some student are attentive(C) Students are never attentive(D) Some students are not attentive Codes :

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Among the following propositions two are related in such a way that they cannot both be true but can both be false . Select the code that states those propositions.<br />(A) Every student is attentive<br />(B) Some student are attentive<br />(C) Students are never attentive<br />(D) Some students are not attentive Codes :