I tried to delete all the data,and recreate the cluster and datebase.
But all i get is the wrong result.
This really wasted time,can anyone give me the final right answer???
db.zips.find({"$and":[{“pop”:{"$lte":10000}},{“pop”:{"$gte":5000}}]}).count()
I think that 10000 is not the number asked.
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Thank you for reminding,but I have used up three chances