Let X1,X2,… be a sequence of independent random variables,
uniformly distributed on [0,1]. Define Nn to be the smallest k such
that X1+X2+⋯+Xn exceeds cn=n2+12n−−√, namely,
Nn
=
min{k≥1:X1+X2+⋯+Xk>ck}
Does the limit
limn→∞P(Nn>n)
exist? If yes, enter its numerical value. If not, enter
−999.
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