Concept:Check the alphabet positions of the letters and find the common pattern among the options.Explanation:R=18, Q=17, S=19 → first letter, first−1, first+1.M=13, L=12, N=14 → first letter, first−1, first+1.F=6, E=5, G=7 → first letter, first−1, first+1.But X=24, W=23, V=22 → first letter, first−1, first−2, i.e. continuous descending order.So XWV is different from the other three.