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Geometric Series
//g++ 7.4.0 //sum of geometric series //created by Rezaul Hoque on December 08,2020 //contact at jewelmrh@yahoo.com #include <iostream> #include <cmath> using namespace std; int main () { float r,m,sum; //number of items in the series int n=7; int a[n]={12,24,48,96,192,384,768}; //first item a[0]=12; //common ratio r=a[2]/a[1]; m=pow(r,n); cout<<"The series is:\n"; cout<<"12+ 24+48+...+768;\n"; if(r<1) sum=a[0]*(1-m)/(1-r); else sum=a[0]*(m-1)/(r-1); cout<<" Sum of the series is:\n"; cout<<sum; return 0; }
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