Friend wants to sell me his AntMiner S9 for $400. Is it a good buy for someone just looking to learn the basics (for now)?

#1
I have a friend who has been pushing me to get into mining with him. I told him I would be starting from the beginning and knew nothing about it, but it just so happens that I have another friend who coincidentally wants to sell me his Ant Miner S9 for $400. I've read that it's supposed to sell for $1,500 - $2,000 these days, but I have no idea of this is a good thing or if he is just trying to recover some of his initial investment by selling me something I might not need.

I didn't even know what hash was or how mining worked last week. Is this something that I would need for someone just looking for a relatively safe low-return investment for learning purposes?
 

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