So how do yall feel, just write your answer and that's all tbh

Could someone me with this question i’ve been stuck on it for 20 minutes

The following hormone had their receptors in the cell membrane except a-insulin b-tsh c-gh d- cortisol

What is the sum of the geometric series in which a1 = 7, r = 3, and an = 1,701? hint: cap s sub n equals start fraction a sub one left parenthesis one minus r to the power of n end power right parenthesis over one minus r end fraction comma r ≠ 1, where a1 is the first term and r is the common ratio