निम्नलिखित में से कौन सी प्रतिज्ञप्तियाँ पुनरुक्तियाँ (तनातनी) हैं?
1.~(A ≡ ~A)
2.A ≡ (B ∨ A)
3.A ⊃ (A ∨ B)
4.(B ⊃ A) ⊃ (A ⊃ B)
A1, 2
B2, 3
C1, 3
D3, 4
🔒 Answer hidden — practise on Mcqkart to check yourself and see the explanation.
Want more like this? Create a free account to practise a full test, track your progress, and get spaced-repetition review.
Practise on Mcqkart →🎓 Book an expert →