Que: Suppose G is the generating function for the sequence 4, 7, 10, 13, 16, 19,…, the find a generating function (in terms of G) for the sequence of differences between terms.

a. (1−x)G−4/x
b. (1−x)G−4/x³
c. (1−x)G+6/x
d. (1−x)G−x²
Answer: (1−x)G−4/x

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