Practice question

[Seymore4Head]

For the record, I don't want a hint.  I want the answer.
I see a practice question is similar to this.
15 <= x < 30  And it wants a similar expression that is equivalent.
So the right answer is 15<= x or x <30
but one of the other answers is 
not (15<= x and x <30)

But it says.....remember you can try this out in the Python shell.
How?