# SPM Practice 1 (Arithmetic Progression) : Question 11

Question 11

An arithmetic progression consists of 10 terms. The sum of the last 5 terms is 5 and the fourth term is 9. Find the sum of this progression.

[ Hint : You can find the sum of the first five terms using

(a) Sn formula using ${S}_{5}$ : $S n = n 2 [2a+(n−1)d]$
(b) Tn formula where ${S}_{5}={T}_{1}+{T}_{2}+{T}_{3}+{T}_{4}+{T}_{5\right]}$