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At the start of an experiment there are 1,000,000 atoms of element A, which has a...

At the start of an experiment there are 1,000,000 atoms of element A, which has a half-life of 15 hours. There are 0 atoms of elements B&C. B has a half-life of 24 hours, and C is stable. After 20 hours, how many atoms of C exist? (Hint: the total number of atoms is constant)
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