Chapter: Arithmetic Progression· Mathematics Part 1 (Algebra)
Answer: \(d = -4\)
\(t_1 = 7 - 4 = 3\), \(t_2 = 7 - 8 = -1\). \(d = t_2 - t_1 = -1 - 3 = -4\). (The coefficient of \(n\) in \(t_n\) is always \(d\).)