Find the fifth term of the geometric sequence with first term 2 and second term 1/5.
2 * r = 1/5 means
r = 1/5 ÷ 2 = 1/10
2 1/5 1/50 1/500 1/5000
or 2 * (1/10)4 = 2 * 1/10000 = 1/5000
