The number of pairs positive integers (m,n) such that mn=25 is
A
0
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B
1
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C
2
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D
more than 2
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Solution
The correct option is B2 The only possibility of m and n in mn=25 is m=5 and n=2 because 52=25 and therefore, the only pair of positive integers (m,n) is (5,2) such that mn=25.