A) For natural numbers a and b, if a divides \[{{b}^{2}}\]then a divides b.
B) For any natural number \[n,\,\sqrt{n-1}+\sqrt{n+1}\]is irrational.
C) Product of distinct prime numbers is always equal to their L.C.M.
D) For any natural number n, \[{{6}^{n}}\] never ends with digit zero.
Correct Answer: A
Solution :
If a (any prime number) divides \[{{b}^{2}}\] and b is natural number, then a divides b.
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