Fill in the blank with the most appropriate word.

3960, 660, 720, 122, 180, 30

2400,3600,5400,7200,12150

210, 140, 105, 84, 70, 63, 52.5

112, 236, 374, 546, 790, 1376

88, 112, 78, 120, 64, 136

Find the wrong number in the series.

3, 6, 18, 72, 360, 2160, 15120

2824     2314      1973     1759     1634     1574

120, 136, 111, 147, 93, 162, 81

Find the wrong number in given number series.

1116, 1135, 1158, 1187, 1224, 1278.

Find the wrong number in given number series.

2658, 2654, 2681, 2645, 2999, 2918