Odd one out 6,9,15,21,24,28,30? A) 21 B) 28 C) 24 D) 30 Solution Each of the numbers except 28, is a multiple of 3. Related MCQs: Find the odd one out: 8, 27, 64, 100 125, 216, 343? Find the odd one out 8, 27, 64, 100, 125, 216, 343? The sum of the first seventy positive odd integers is? Select the odd one in the series: 14 21 49 65 84