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## Main Question or Discussion Point

Hi,

A radioactive substance which has a half-life of, say 5 years, will

My question is,

Thanks.

A radioactive substance which has a half-life of, say 5 years, will

**'certainly'**decay to half its amount after 5 years ( i am good at maths!).My question is,

When radioactivity is a random process, where does thisWhen radioactivity is a random process, where does this

**'certainty'**come into picture?Thanks.