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If we go with option 2, what is the chance a user will be shown only a single ad in 100 stories?

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We have two options for serving ads within Newsfeed:
1 – out of every 25 stories, one will be an ad
2 – every story has a 4% chance of being an ad

For each option, what is the expected number of ads shown in 100 news stories?
If we go with option 2, what is the chance a user will be shown only a single ad in 100 stories? What about no ads at all?
in Data Science by ♦ Diamond (41.4k points) | 3 views

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