In what way does the Drake equation combine the various factors (e. g., fraction of stars with planets, fraction of planets that can support life) in an attempt to determine the number of technically advanced civilizations existing elsewhere in the Milky Way Galaxy?

Drake equation N=R×fs×fp×ne×f1×fi×fc×L where

R=average rate of star formation

fs=fraction of good stars that have planetary systems

Fp=the fraction of stars with habitable planets

ne=number of planets around these stars within an ecoshell

f1=fraction of those planets where life develops

fi=fraction of living species that develops intelligence

fc=fraction of intelligence species with communication technology

L=lifetime of the communication phase

Explanation:this equation is an argument based probability used to estimate the number of active communicative extra terrestrial civilization in the milky way galaxy.