Background: The American Banjo Museum located in the Bricktown Entertainment district is dedicated to preserving and promoting the music and heritage of America's native musical instrument – the banjo. With a collection valued at $3.5 million it is truly a national treasure. An interpretive exhibits tells the evolution of the banjo from its humble roots in American slavery, to bluegrass, to folk and world music.
Question: How much is the collection worth in the museum?
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<extra_id_0> $3.5 million<extra_id_1>