Please sum this sum , $\sum_{k=0}^{n} \binom{r+a+bk}{a+bk} x^{bk}$. Where r ,a and b are fixed integers
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1What are your thoughts? What have you tried? Do you have any reason to expect a closed form? – Robert Israel Aug 01 '23 at 14:51
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I had tried with change of variables and now I have done it. Thank you for the comment sir. – Brajesh Kumar Dhakad Aug 04 '23 at 13:48