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 I'm no expert, but the way you get a private key is with math. You know who has a really good explanation on this Andreas Antonopoulos  
 So you can't go backwards only foward and something about you add to the private key to get a public key or something like that so you cant get a private key randomly he explains it very very well  
 Yes. There's hashing involved in that case. 
 Yes so when you hash i take it as math 1+1 but its random numbers that never give the same outcome  
 My point is, everything that uses SHA256, will generate an outcome of 1 in 2²⁵⁶, including any collisions.