Concept:In an odd-man-out series, all terms except one follow the same relation.Explanation:From 390 onwards: 2390−4​=193, 2193−4​=94.5, and 294.5−4​=45.25.So each term is obtained by subtracting 4 and dividing by 2.For the first step to fit, the term before 390 should be 784, because 2784−4​=390.But the given first term is 787, so it breaks the pattern.Answer:The odd term is 787 (Option C).