by Sage Pearce-Higgins Sun Dec 16, 2018 7:11 am
No worries - please feel free to ask questions on old threads. Your question is a common one, and there's an easy answer. I caution my students to be very careful with the topic of redundancy and concision - these topics are rarely tested on GMAT, and looking for redundancy and concision tends to cause, rather than prevent, errors. Basically, GMAT uses redundancy in much more crude and obvious ways than simply in the addition of a potentially unnecessary preposition. A sentence such as 'Prices rose by at least 10% or more.' is clearly repetitious: the phrase 'or more' just repeats the meaning of 'at least'. So, if you're going to look for redundancy, look for something more significant than just an unnecessary 'on'.
In the case of open markers, repeating short words can actually be useful to avoid confusion. Take this example: 'Next year we're going on holiday to Palermo in Italy and France.' Now, we might get mixed up with the parallelism and think the 'and' is joining Italy and France. To make the meaning clearer, adding in an extra 'to' helps: 'Next year we're going on holiday to Palermo in Italy and to France.'