MCQ
The proposition $(p \rightarrow \sim p) ∧ (\sim p \rightarrow p)$ is
- ✓a contradiction
- Ba contradiction and a tautology
- Cneither a contradiction nor a tautolog
- Da tautology
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$11$. If $\frac{a_1^2+a_2^2+\ldots+a_{11}^2}{11}=90$, then the value of $\frac{a_1+a_2+\ldots+a_{11}}{11}$ is equal to