a) What is the generating function for {ad, where ak is
Chapter 7, Problem 7.4.24(choose chapter or problem)
a) What is the generating function for {ad, where ak is the number of solutions of XI + X2 + X3 + X4 = k when XI , X2 , X3 , and X4 are integers with XI ::: 3, I ::: X2 ::: 5, 0 ::: X3 ::: 4, and X4 ::: I? b) Use your answer to part (a) to find a 7 .
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