Michael's right and Firecat has asked something (s)he didn't want to ask (with this wording). Which leaves open the question whether Jeri has understood the question as it is usually asked (as I did, for instance, without sufficient reading) and from that understanding has found a creative and counterintuitive solution to the question that has not been asked actually (but should have been asked) or whether she has understood the question as it was asked and has made a simple mistake (my guess is on the first possibility).

It reminds me of one of my bigger mistakes when I was asking what I thought was a very cleverly worded question in a written examination that only the very best of the students should have been able to get correct. I then made a mistake myself and found that the first glance obvious response was now correct after all and the only ones that did not have this solution were the best of my students.

Wolfgang