Series : UY, SV, QS, OP, ? The pattern followed in each letter of the terms is : 1st letter : U (-2 letters) = S (-2 letters) = Q (-2 letters) = O (-2 letters) = M 2nd letter : Y (-3 letters) = V (-3 letters) = S (-3 letters) = P (-3 letters) = M Thus, missing term = MM