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The population p(t) at time t of a certa...

The population p(t) at 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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