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Congruences involving quadrinomial coefficients

  • Mohammed Mechacha

摘要

For nonnegative integers n and k, one defines the quadrinomial coefficient \(\left( {\begin{array}{c}n\\ k\end{array}}\right) _{3}\) n k 3 as the coefficient of \(x^k\) x k in the polynomial expansion of \(\left( 1+x+x^2+x^3\right) ^{n}.\) 1 + x + x 2 + x 3 n . In this paper, we establish congruences (mod \(p^2\) p 2 ) involving the quadrinomial coefficients \(\genfrac(){0.0pt}0{np-1}{p-1}_{3}\) n p - 1 p - 1 3 and  \(\genfrac(){0.0pt}0{np-1}{\frac{p-1}{2}}_{3}.\) n p - 1 p - 1 2 3 . This extends some known congruences involving the binomial and trinomial coefficients.