A) If\[\sqrt{a}+\sqrt{b}\]is an irrational number, then\[\sqrt{ab}\]is also an irrational number.
B) The reciprocal of an irrational number is always an irrational number.
C) There are infinitely many rational numbers between any two irrational numbers.
D) \[\text{7}\times \text{13}+\text{13}\]is a prime number.
Correct Answer: D
Solution :
\[\therefore \] The product of two prime numbers is composite. \[=\sqrt{64+36}\]\[=\sqrt{64+36}\]is not a prime number.
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