Many species of Thysanoptera are known to be habitually parthenogenetic. The eggs are laid on the food-plant, those females possessed of an ovipositor cutting through the epidermis and placing their eggs singly within the plant-tissues; a single female may take five or six weeks to deposit all her eggs.
Suppose, for instance, that n=5, so that we take five factors (A+a) (B+b) (C+c) (D+d) (E+e) and find their product.
So a signup process that requires users to take five steps through five pages will have a lower conversion rate than a process that only has one or two steps/pages.
While bachelor's degrees have traditionally been seen as "four-year" degrees, with scheduling difficulties, internships, and other obstacles, they frequently take five years for even full-time students to complete.