ort-term memory in dolphins.  She randomly presented visual arrays with 1, 2, 3, 5, 8, 13, 21 items for five minutes.  She asked 3 dolphins to remember the items. She then presented a new array with old and new items.  The dolphins responded by touching the items with their tails.  She hypothesized that Dolphins could remember 3 items accurately, but not more than that.  How many pairwise comparisons

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