See image — AITS & Test Series Chemistry Question

💡 Solution & Explanation

Consider the inequality   2 2 2 i i i i x y x y            2 2 2 2 2 i.e. 2 2 2a 3 b c 8 9 1 2a b c             2 2 2 49 2a b c 18    and least value is achieved when 2 2 3 1 1 i.e. b c k 2a    7 a 2k, b 3k, c k k 18      