Answer :
we know that
a1=7
r=2
n=14
then
Sn=a1*[(r^n)-1]/(r-1)-------------->S14= 7*[(2^14)-1]/(2-1)=114681
the answer is 114681
we know that
a1=7
r=2
n=14
then
Sn=a1*[(r^n)-1]/(r-1)-------------->S14= 7*[(2^14)-1]/(2-1)=114681
the answer is 114681