Hi.
I'm thinking of start selling bitcoins on localbitcoins for paypal and stuff, but I need to know which best way to double bitcoins is it cloud mining? investing or trading?
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thanks

You have taken right decision of selling bitcoins in localbitcoins.
But better avoid cloud mining farms as it would take around six months to even recover your investment.Also,most of them are scam.
Trading is considered as the legit option for earning bitcoins.But without prior experience,you may end with a huge loss.