Answer: Hello mate!
a geometric sequence is of the form
a∑r^n = a + ar + ar^2 + ar^3..... and so on.
then if r is a number bigger than 1, the therm r^n only increases when n increases, which means that the terms in this sequence are always increasing, because r^n < r^(n+1)= r*(r^n), here you use that r > 1 to prove that r^n < r(r^n)
This means that the statement is true.