How many times do you see an ad?

The best ad redundancy is said to be 7 (7 times)
How does the Law Of Large Numbers apply here?
What is an adequate sample size?
And more importantly what sample is defined as being indicative?

ex: CR of what?

• The ad is clicked;
• a landing page has a CTR to a offer or target;
• or a post-back of a sale?

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* This article was originally published here

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