Additional Mathematics 0606 / Series / 3.623.62: GP with S2=9S_{2}=9S2=9 and S∞=25S_{\infty}=25S∞=250606/12/O/N/25 — Question 3 · 6 marksMark as done · Save for later · Show all solutions(a)A GP has S2=9S_{2}=9S2=9 and S∞=25S_{\infty}=25S∞=25. Find the possible values of rrr.[4]▸ Answer(b)Find the first term for each possible rrr.[2]▸ Answer▸ Official mark scheme← 3.60: AP sum relation and AP–GP common ratio3.63: Log/exponential equations; AP and dual GPs →
