The correct answer is 40,320.
Presumably your answer was much smaller than this. You would have performed a few steps of computation and then estimated the product from there, underestimating because such adjustments typically are insufficient. Also, because the result of the multiplication of the first few steps in the descending sequence is higher than with the second ascending sequence, your answer to the first estimation was most likely a larger number than the second. In an experiment, the median estimate for the descending sequence was found to be 2,250 whilst for the ascending sequence it was 512.