N_{X}
therefore represents the number of civilizations
related to a particular type of sun. In order to
determine the number of all civilizations in the galaxy,
the sum of all partial results, i.e. across all spectral
classes, must then be formed:
12.2.1 Equation 
N_{ziv}
= ∑ N_{X}
= ∑ (A·F_{X}·F_{ph}·F_{k}·F_{Liz}) 
The number A of stars in the galaxy is
the same for all star types and can therefore be drawn
from the sum:
12.2.2 Equation 
N_{ziv}
= ∑ N_{X}
= A·∑ (F_{X}·F_{ph}·F_{k}·F_{Liz}) 
The probabilities F_{X,} F_{ph}, F_{Liz}
depend on the spectral class of the respective star set
and F_{k} on the observation instrument used. All
factors can be empirically determined in the long run,
according to sentence 6.1.2 within 2 centuries.
Based
on the Seager approach, Equation 12.2.2 represents the
most general form in which the subject of intelligent
life or technological civilizations, on a habitable
planet, in the galaxy, can be mathematically represented.
Equation 12.2.2 is therefore referred to as the "General Approach". Equation 12.2.2 can be used to
estimate the number of civilizations in the galaxy.
According to previous observations, the frequency for G
stars, i.e. sunlike stars, is about 28%
of the total stars.
The red dwarfs, i.e. the M stars, represent the major
part, with about 70 % of the total
stars, of which only 80 % are
observable. Therefore:: N* = A · F_{RZ}
· f_{Q}.
The remaining 2 % of the total stars
belong to the remaining 11 spectral
classes and are not taken into account in this estimation
without impairing the observation.
The probabilities for sunlike stars are known according
to chapters 1 to 7. The data for the red dwarfs are only
partly taken from the data of Sara Seager, because some
of her assumptions (life and biosphere) are too
optimistic. Then the following values are used for
equation 12.2.2:
N_{ziv}
= A·F_{s}·F_{ph}·F_{k}·F_{Liz}
+ A·F_{RZ}·F_{Q}·F_{ph}·F_{O}·F_{Liz}
N_{ziv} = (100300)·10^{9} · 1:15,000
· 0.004,7 · 1:1001
+ (100300)·10^{9}
· 0.7 · 0.8 · 1:4200 · 0.001 · 1:1001
N_{ziv} = 32  94
+ 14  40
N = 46 – 134 technological civilizations
Comparison General Basic Model
According to sentence 8.4.5 of the General Basic
Model, the number of star systems, with Earthlike
planets, in habitable zones that could support
civilizations is probably between 35  maximum
1,034.
The Drakecorrected General Basic Model 9.8.2 provides 22
 199 "Earths 2" with technological
civilizations.
The Seagercorrected General Basic Model 11.4.2 provides 35
 334 "Earths 2" with technological
civilizations.
The calculated window of the General Approach corresponds
well with the window for the General Basic Model and thus
results in a good match between the two approaches. This
results in a good agreement between the general approach
and the previous probability considerations from the
corrected general basic model.
This confirms that the General Approach
and the General Basic Model are two equivalent
approaches.
Comparison Drake Equation
The Drake equation 9.1.2 provides 9 
109 extraterrestrial technological civilizations
and is thus well within the range of the calculated
window of the General Approach.
The corrected Drake equation 9.5.3 lets expect 11
 146 extraterrestrial technological
civilizations and is thus well within the range of the
calculated window of the General Approach.
This results in a good agreement of the general approach
with the Drake equation.
This confirms that the General Approach
and the Drake equation represent two equivalent
approaches.
