The world of complex PM formula related to the exam is really uneasy and unsecured area of study,unless you are specialized in it.The range of this difficulty can vary from being easy to an extremely difficult one.But,usually,this ranges only from an easy to a moderate degree.Comparatively,those formulas are sometimes even different from one source of information to other.Since,you have to use every possible tool that is possibly available to you for your exam preparation,I still would recommend them to be studied from this source,and don't go very much deep to them,as,it can be very complicated ,and its not really a big deal of concern.Don't worry,be happy,you still can get your near six sigma chance of passing the exam with or without it.:)
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