Brainteaser - Second Moment
Second Moment
Probability
Five Rings
xxxxx xxx xxxxxxxx xx x xxxxxx xxxxxxxx \(x\), xxxxxxx xx \(\xxxx{xxx}(x) = xx\), xxx xxx xxxxxxxx xxxxx xx \(x\), xxxxxxx xx \(x[x] = x\), xxxxxxxxx xxx xxxxxxxx xxxxx xx \(x^x\), xxxxxxxxx xx \(x[x^x]\).
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