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In a certain country, a person is born every 4 second and person dies every 10 seconds . Therefore , the birth and death rates account for a population growth rate of one person every--

A. 6 seconds
B. 6.5 seconds
C. 6.67 seconds
D. 14 seconds
E. None of these
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সঠিক উত্তরঃ C. 6.67 seconds
Explanation: