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I have half life of single connection between strands element. How can I count half life of a strand if strand has 10 of such a connections.

My current approach Lets say that I have 10 strands, each strand has 10 connections. So there is 100 connections. After time $t_{HalfLife}$ there will be only 50 connections. But I have no idea how to convert this 50 to number of strands with 10 connections.

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    One break is enough to kill strand2011-06-07

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This assumes that a single break causes the strand to fail. The probability of no break of one connection in an interval of length $t$ is $\exp (-\lambda t)$. The half life is $\frac{\log 2}{\lambda}$ as that is the time for half the connections to break. Given $10$ connections, the failure rate is $10 \lambda$, so ...

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    @Darqer: Looks good.2011-06-07