Directions: The question consists of a number series which contains a wrong term. This term is given as one of the four alternatives among the four numbers given below. The wrong term is 89, 78, 86, 80, 85, 82, 83

The series follows a pattern of alternating subtraction and addition: 89 - 11 = 78, 78 + 8 = 86, 86 - 6 = 80, 80 + 5 = 85, 85 - 3 = 82, 82 + 1 = 83. The pattern of differences is -11, +8, -6, +5, -3, +1. This is inconsistent. Checking the series 89, 78, 87, 80, 85, 82, 83, the differences are -11, +9, -7, +5, -3, +1. The term 86 is the wrong one.