Find the wrong number in the following number series. 4866, 2432, 1218, 610, 306, 154, 78

The pattern in the series is: each term = (previous term)/2 - 1. Starting from 4866: 4866/2 - 1 = 2433 (but 2432 is given, which is 1 less). For 2432: 2432/2 - 1 = 1215 (but 1218 is given, which is 3 more). From 1218 onwards, the pattern fits perfectly: 1218/2 - 1 = 609 (close to 610), 610/2 - 1 = 304 (close to 306), 306/2 - 1 = 152 (close to 154), 154/2 - 1 = 76 (close to 78). The number 2432 breaks the pattern as it creates an irregularity that propagates through the series.