Link: https://www.gregmat.com/quizzes/quiz/gre-quant-flashcards-group-3-quiz (Question 7)
the largest integer the sum is divisible by would by the ‘sum’ itself. since the largest factor of any number is the number itself
It has to be applicable for all valid A,B, and C. There are multiple sums we can attain, so “sum itself” can’t be the answer because there isn’t just one constant sum.
We need to find the largest integer that divides every single one of those possible sums.