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Suppose you have a collection foo with an index created using the statement db.foo.ensureIndex({a:1 - b:-1 - c:1}). Which of the following queries could use the index

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Suppose you have a collection foo with an index created using the statement db.foo.ensureIndex({a:1 - b:-1 - c:1}). Which of the following queries could use the index






 
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