The correct way to add a life path is to reduce each part first to discover the core resonance of the day, month and year, and then find out the overall resonance.
(D+D)+(M+M)+(Y+Y+Y+Y)=Life path
so in this case
(1+4)=5
(0+4)=4
(2+0+1+8)=11
5+4+11=20/2 life path
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