Defects per million opportunity (DPMO) is a measure of occurrence of defects per million opportunity. It is calculated by the formula shown in the picture below.

Here D is the No of defects observed, S is the sample size and O is the no of opportunities for defects per unit. This will be more clear from the following example.
Example
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Hi
So refreshing! Clear and concise.
Thanks
L. Luthuli
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