What is the sum of the geometric sequence 4,12,36,...if there are 9 terms?

You can see that

sequence is
increasing by multiplying a number by 3. For example multiplying first number "4" by "3"
will give you 12, then 12 times 3 will give you 36 and so on. Doing that will give you
this
sequence

4,12,36,108,324,972,2916,8748,26244

When
you sum them up you will get 39364