You have a collection of knickknacks that you are planning to line up on a shelf.

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You have a collection of knickknacks that you are planning to line up on a shelf. Your collection consists of 12 knickknacks, but you only have room for 7. How many different ways can you display knickknacks on your shelf? 

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    You have a collection of knickknacks that you are planning to line up on a shelf.
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