Answer:
6144 clients
Explanation:
Number of clients in the beginning = 3
The number of clients doubled each month. This means for every month the number of clients was 2 times the previous month. This can be modeled by a geometric sequence, with first term as 3 and common ratio of 2.
The general formula for the geometric sequence is:

Here,
is the first term of the sequence which is 3
r is the common ratio which is 2 and n represents the number of term.
We need to calculate the number of clients after 1 year i.e. after 12 months. So here n will be 12. Using these values, we get:

Thus, after 1 year the company started by Nick will have 6144 clients