Concept:The series must follow a consistent difference pattern.Explanation:The given terms are 784,778,772,763,752.Calculate the differences:784−778=6778−772=6772−763=9763−752=11The differences 6,6,9,11 are not in a clear pattern.Now test the expected pattern of subtracting consecutive odd numbers: 5,7,9,11.Apply this pattern from 784:784−5=779779−7=772772−9=763763−11=752The correct series should be 784,779,772,763,752.So 778 is the term that does not fit and is the odd one out.Answer:The odd term is 778, which is option D.