The pattern is subtracting consecutive odd numbers starting from 27: 197-27=170, 170-25=145, 145-27=118 (should be 118, not 120), 118-25=93 (should be 93, not 101). The odd one is 120 because it should be 118 (197-27=170, 170-25=145, 145-27=118). The number 120 breaks the alternating subtraction pattern of 27, 25, 27, 25.