Correct option is DGiven: 62 : 30 :: 84 :?Logic: (1st number ÷\div÷ 2) - 1 = 2nd numberFor, 62 : 3062 ÷\div÷ 2 = 31, 31 - 1 = 30Similarly,84 : ?84 ÷\div÷ 2 = 42, 42 - 1 = 41Thus, correct option is (d).