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I would suggest to your client that having more than one format will increase sales. It should be easy to check what other people are using primarily in her field. Also where she wants to sell her book would be important. Personal website, the more choices the better. Amazon, obviously at least one of the Amazon formats. Likewise Kobo. If her intended vender sells several formats they should all be included.
While many people use PDF and have tablets or computers to read them on, PDF is unlikely to appeal to the ereader crowd.
If she is writing an engineering book that is highly anticipated, PDF would probably be good enough. Fiction, good luck with that there.
Helen
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