(a) Find the generating function for the sequence 0, 1, 3, 6, 10, 15, . . ....

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(a) Find the generating function for the sequence 0, 1, 3, 6, 10, 15, . . . (where 1, 3, 6, 10, 15, . . . are the triangular numbers of Example 4.5).
(b) For n ∈ Z+, determine a formula for the sum of the first n triangular numbers.
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