CAT 2017 Slot 1 QA Q28 Inequalities & Modulus

Question 28 of the Quantitative Ability (QA) section, CAT 2017 Slot 1, with CAT's official answer.

If a, b, c, and d are integers such that a + b + c + d = 30, then the minimum possible value of (a - b)2 + (a - c)2 + (a - d)2 is (TITA)

TITA: type in the answer. There are no options and no negative marking.

Answer: 2 Inequalities & Modulus TITA

A worked solution for this question is being written. Meanwhile, practise it in a timed mock and see how other aspirants did.