If you can't recall whether or not you were lending your account out, chances are quite high that you were. If you do not know why you got banned (truthfully) then chances are they got you banned.
Banned accounts are not recoverable.
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Computing the probability that at least one of the following events will occur:
P(a or b ... or z) = 1 - P(!a and !b ... and !z)
Probability
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