Concept:In an odd-man-out series, all terms except one follow a fixed mathematical rule.Explanation:Check the rule ×2−1 on the later terms.341×2−1=681681×2−1=1361So the term before 341 should be (341+1)÷2=171.Also, 86×2−1=171.The expected series is 86,171,341,681,1361.But the given term is 179, so 179 is the wrong term.Answer:The odd term is 179 (Option E).