Let's see what they ask.
Let's see what do they ask.
What is the difference in meaning, I think second one is grammatically sounds right isn't it?
No, the second one is not grammatically correct, and it doesn't sound right, either. " is a question. You don't need a question.
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No, the second one is not grammatically correct, and it doesn't sound right, either.
"What do they ask?" is a question. You don't need a question. You need a noun clause that is the direct object of "see."
Let's see who they are.
Let's see what happened.
Let's see who won.
Let's see what they want.