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Negation of ' is irrational or is rational' is?
(a) is rational or is rational.
(b) is rational and is irrational.
(c) is irrational and is not irrational.
(d)None of these.

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Important Questions on Mathematical Reasoning
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Consider the following three statements:
is a prime number
is a factor of
of and is
Then the truth value of which one of the following statements is true?

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