Poisson's Theorem says:
so this would refer to going from step 1 to step 2, not 2 to 3.
But I don't see the applicability here. The only sensible (to me) way to approximate something like
is to use the binomial approximation:
We could use Poisson's theorem on the second term and get that
but this is a horrid approximation.
There is no use for Poisson's theorem here. I have already explained in
another post how you get to line 2 from line 1.
Line 3 is obtained by evaluating line 2 on your calculator.
Poisson's theorem tell you how to approximate a binomial distribution (under
certain conditins) by a Poisson distribution, and if that is involved in this
question it occured before your line 1.
i see.if there used Poisson theory.it should be between step 1 and step 2.not 2 and 3.
both CaptainBlack's and topsquark methods can solve this subject(lim. and Poisson theory).
i thought they don't typeset my book's clearly,and i did'nt see the subject carefulness enough,so i thought the Poisson Theory used in the 3rd step
now i have understand how y works to step 3.
thx all of you.