Explicit formulas for geometric sequences

Wang Lei and Amira were asked to find an explicit formula for the sequence $30,150,750,3750,\text{…}$‍, where the first term should be $g(1)$‍.

Wang Lei said the formula is $g(n)=30\cdot 5^{n-1}$‍, and

Amira said the formula is $g(n)=6\cdot 5^n$‍.