[GTL]

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I don't understand how it can be "impossible" to get a perfect score. I think a "perfect score" would simply mean the highest score within the possible score range.

As in, if you get all the questions right, you got a perfect score, regardless of what that score it or what the test-makers say a perfect score is.

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you would be wrong. there is a maximum score for the test. every once in a while, someone gets closer to the maximum. it is within the realm of possibility to achieve the maximum score. it has never happened. therefore, it is possible to score the maximum, but has never happened, and is highly unlikely.

think about flipping a coin 1000 times. it is possible to get a perfect 1000 flips in which the coin lands on heads every time. it is nearly impossible. someone who does it 980 times in a row, doesn't have a perfect score because they have the highest amount. 1000 in a row is still theh perfect score.

edit - the test isn't multiple choice, so no one has gotten all the questions right.