I used the expression Pros and Cons in an exam paper. I was told that I should not use abbreviations! What words should I have used?
You will find the phrase Pros and Cons in our larger dictionaries which do not mark it as informal or in any way restricted in use. The complete 20-volume Oxford English Dictionary explains that it is an abbreviation of the Latin phrase pro et contra meaning for and against and that it has been in use in the abbreviated form since the 16th century. In other words, it is a well established standard usage.
The alternative is the much longer arguments for and against.