=+27.18. 21.21 Stirling's formula. Let S ,, = X, + . . . +X ,,, where the

Question:

=+27.18. 21.21 Stirling's formula. Let S ,, = X, + . . . +X ,,, where the X ,, are indepen-

dent and each has the Poisson distribution with parameter 1. Prove succes-

sively

- n F

-"E(") k ="

n - k n" +(1/2)e -1

(a) E In n!

Sp -n

(b)

=N7.

Vn S, - n 1

(c) E

-EN-]=

Vn 12 TT

(d) n! ~ 1/2" n" +(1/2) e **

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