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The half-life of a radioactive substance is 50 years. If you start with some amount of this substance, what fraction will remain in 200 years?

The half-life of a radioactive substance is 50 years.

If you start with some amount of this substance, what fraction will remain in 200 years?

What fraction will remain in 250 years?

The fraction that will remain in in 200 years is the following? _

The fraction that will remain in in 250 years is the following? _

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