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The population `p(t)` at a time t of a certain mouse species satisfies the differential equation `(dp(t))/(dt)=0.5p(t)-450.` If `p(0)=850`. Then the time at which the population becomes zero is

A

`(1)/(2) ln 18`

B

`ln 18`

C

`2 ln 18`

D

`ln 9`

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The correct Answer is:
C
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