Number of nuclei of a radioactive substance are 1000 and 900 at times t=0 and time t=2 s. Then, number of nuclei at time t=4s will be

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Number of nuclei of a radioactive substance are 1000 and 900 at times t=0 and time t=2 s. Then, number of nuclei at time t=4s will be
A. 800
B. 810
C. 790
D. 700

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