I don't understand how the book got the answer of 5/9
The question is:
Given the two terms of the geometric sequence, find the individual term.
t4=5 t8=405 find t2
i used the formula tn = ar^n-1 for this
t8/t4 = 405/5 = ar^7 / ar^3
=81 = ar^4
a = 5/81