I was thinking about these negations. Do these mean the same thing?
There is no point in ...
There is not a point in ...
I have no clue
I do not have any clue
The difference is in how idiomatic or natural the expressions are, and not in the literal meanings. (I am a native American English speaker; others' intuitions may differ).
So we could almost always use the first expressions of each pair that you provided under normal circumstances. But we just as well could use the alternatives I listed instead. Finally, the last listed expressions don't sound right; they might only be used when we want to emphasize.
The meanings are the same, so it's a matter of what will sound natural.
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