How many ebook reader owners also own a tablet?

by Nook vs Kindle

In a Facebook poll of 38 respondents, 47.4% chose “I only own an ereader and no plans to buy a tablet”. How we count

I only own an ereader and no plans to buy a tablet
47.4%
I already own both an ereader and a tablet
28.9%
I own an ereader but plan to buy a tablet also
23.7%
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