The formula of findind any nth term in geometric progression (G.P) is given by :
tn=an = a *(rn-1)
here a is the first term of G.P and r is the common ratio, tn is the nth term.
now if you want to take out the value of 7th term then , using the same formula , we get
t7 = a7 = a * r7-1 = a * r6
similarly any nth term can be find out using the above formula and if we know the number of total terms in G.P e.g n=10 , then we can use the above formula and find out t10 which would be the last term of G.P .