12a. [2 marks] The first three terms of an arithmetic sequence are uj, 5u, - 8 and 3u, + 8. Show that u1 = 4.
12a. [2 marks] The first three terms of an arithmetic sequence are uj, 5u, - 8 and 3u, + 8. Show that u1 = 4. 12b. [4 marks] Prove that the sum of the first n terms of this arithmetic sequence is a square number
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