kathleenirwin
07.10.2021 •
Mathematics
what is the probability that 2 precedes 1 when we randomly select a permutation of {1, 2,...,n} where n ≥ 4?
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Ответ:
The first person shake n-1 hands, the second n-2the last person shake one hand
1+2+3++n-1=n*(n-1)/2=66
⇒ n*(n-1)=66*2=132=12*11
⇒ n=12 people was at the party