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A tautology is a Boolean formula that is always true. Which of the following is a tautology?
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 two propositions. Propositions : a) Every student is attentive. b) Some students are attentive. c) Students are never attentive. d) Some students are not attentive
Among the following propositions two are related in such a way that one is the denial of the other. Which are those propositions ? Select the correct code : Propositions : (a) All women are equal to men (b) Some women are equal to men (c) Some women are not equal to men (d) No women are equal to men
Among the following propositions two are related in such a way that they can both be true although they cannot both be false. Which are those propositions? Select the correct code. Propositions: (a) Some priests are cunning. (b) No priest is cunning (c) All priests are cunning. (d) Some priests are not cunning.
Reaction of LiAlH4 with one equivalent of Me3N∙HCl gives a tetrahedral compound, which reacts with another equivalent of Me3N∙HCl to give compound N. The compound N and its geometry, respectively, are: 
In a compound weighing 1200 gm, metals A and B are in the ratio 5 : 7 and in another compound weighing 800 gm, metals A and B are in the ratio 3 : 1. Find the difference between weight of metal A and metal B in the third compound which is the mixture of compound 1 and compound 2.
If beginning work in process equivalent units are 2500 units, work done in current period equivalent units are 3800 units and ending work in process equivalent units are 5000, then complete equivalent units in current period are
A compound proposition that is always ___________ is called a tautology.
A compound proposition that is neither a tautology nor a contradiction is called a ___________
When in a group of propositions, one proposition is claimed to follow from the others, that group of propositions is called