If you don't know how many radioactive isotope atoms were present at the time a rock was formed,how can you tell how many have decayed since that time?

Name: If you don't know how many radioactive isotope atoms were present at the time a rock was formed,how can you tell how many have decayed since that time?
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The Answer of If you don't know how many radioactive isotope atoms were present at the time a rock was formed,how can you tell how many have decayed since that time?

If You Don't Know How Many Radioactive Isotope Atoms Were