Additional Mathematics 0606 / Series / 3.533.53: AP of twelve terms and GP sum inequality0606/22/O/N/23 — Question 9 · 10 marksMark as done · Save for later · Show all solutions(a)An AP has twelve terms. Sum of first three is −36-36−36; sum of last three is 727272. Find aaa and ddd.[5]▸ Answer(b)A GP has first three terms 111, 1.21.21.2, 1.441.441.44. Find the smallest nnn with Sn>500S_{n}>500Sn>500.[5]▸ Answer▸ Official mark scheme← 3.52: Derivative of xsin 2xx\mathrm{sin}\,2xxsin2x; AP of twelve terms3.54: Exponential calculus; AP and linked GP →
