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Write truth values of the following statements :`sqrt5` is an irrational number but 3 +`sqrt 5` is a complex number.
Using truth tables, examine whether the statement pattern (p ∧ q) ∨ (p ∧ r) is a tautology, contradiction or contingency.
Write the following statement in symbolic form and find its truth value:
`forall n in` N, n2 + n is an even number and n2 - n is an odd number.