How many hydrogen atoms will be added along with one carbon atom in the next member of a homologous series?

In a homologous series, each successive member differs by a CH2 group. This means that two hydrogen atoms are added along with one carbon atom to form the next member in the series. For example, in the alkanes homologous series, methane (CH4) is followed by ethane (C2H6), which adds one carbon and two hydrogen atoms.