The sum S of the first n terms of an arithmetic series is given by S. = n(2n + 3). Th first term of the series is a. n n (a) Show that a = 5 (b) Find the common difference of the series. (c) Find the 12th term of the series. Given that 1 + S. p + 4 2 S, %3D (d) find the value of p.

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