Create find_sum_of_gp_series.dart

program/program/find-sum-of-gp-series/find_sum_of_gp_series.dart

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+import 'dart:math';
+
+void main() {
+
+  int a1 = 2; // First term of the GP
+  int r = 3; // Common ratio
+  int n = 3; // Number of terms
+
+  // Calculating the sum of the GP series
+  double sum = calculateGPSum(a1, r, n);
+
+  // Printing the output
+  print("Sum of GP series: $sum");
+}
+
+double calculateGPSum(int a1, int r, int n) {
+  // Using the formula for the sum of GP series
+  return a1 * (pow(r, n) - 1) / (r - 1);
+}