What are two colons mean in last challenge question?

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744 for the answer is not correct unless add two colons.

the answer is 744 and the query that produce this answer is

{results: {$elemMatch: {$gte: 70, $lt: 80}}}

I think the colons have no significance in here.

Yes, but my point is I cannot type 744 directly unless with that two colons

Hi @Yuanwen_52772,

Thank you for reporting this issue!!

We will try to resolve it as soon as possible. As this is ungraded exercise, you can proceed further with the course.

Happy Learning!!

Thanks,
Sonali

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