kenneth rosen chapter 8 section 8.4 exercise question 5 option (f)
in Mathematical Logic
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Can anyone explain how to solve part (f) of this question?

It does not seem to fit any standard forms of the generating functions. 

On expanding we get, 4C0+5C1+6C2+7C3+8C4+ …….. inf

 

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n-1C0 + nC1 + n+1C2 +.…

= /sum ( n-1+r Cr .X pow r) from r=0to r= infinity

=1/(1-x)pow n

In given question n=5

So,  closed form will be 1/(1-x)pow 5
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