The word has should be added before always to form the present perfect tense. This tense is used to indicate an action that started in the past and continues up to the present.
27, 35, 51, 75, 109, 147
44, 57, 81, 119, 170, 234, 311.
-1236, -724, 5, 1005, 2336, 4062
180000, 7200, 360, 36, 2.4, 0.48
9 20 63 255 1285 7716
...975, 1050, 1125, 1200, 1275, 1325
75, 450, 225, 1330, 675, 4050
2824 2314 1973 1759 1634 1574
Find the wrong number in given number series.
2669, 2838, 2993, 3185, 3397, 3629
131, 212, 261, 286, 295, 299