>>>How many flowers have I got if all but 2 of them are roses, all but 2 of them are daffodils and all but 2 of them are carnations ?
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>>3. (or any number <=3)
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>"All but 2 are roses" means the same as "2 of them are not roses". How can you have 2 that are not roses if you have a total of 0 or 1 flowers? You need a total of at least 2 flowers.

Right. The correct answers are 2 or 3.