3, 4, 5, 6,....
t1 = 3, t2 = 4, t3 = 5, t4 = 6
Here, \(\frac{t_2}{t_1}=\frac43,\frac{t_3}{t_2}=\frac54,\frac{t_4}{t_3}=\frac65\)
\(\because\) \(\frac{t_2}{t_1}\neq\frac{t_3}{t_2}\neq\frac{t_4}{t_3},\) then given sequence is not a Geometric progression.