#include <cmath>
#include <iomanip>
#include <iostream>

double* Production(const double* arr, double* product, int amount) {
  double lower = static_cast<double>(1) / static_cast<double>(10000);
  product[0] = pow(arr[0], lower);
  for (int i = 1; i < amount; ++i) {
    product[i] = product[i - 1] * pow(arr[i], lower);
  }
  return product;
}
void FindNoise() {
  int num_of_plants = 0;
  std::cin >> num_of_plants;
  double* arr = new double[num_of_plants];
  double* product = new double[num_of_plants];
  for (int i = 0; i < num_of_plants; ++i) {
    std::cin >> arr[i];
  }
  product = Production(arr, product, num_of_plants);
  CountNoise(product, arr);
  delete[] arr;
  delete[] product;
}
void CountNoise(const double* product, const double* arr) {
  int func_calls = 0, left = 0, right = 0;
  double LowerFirstCase =
      static_cast<double>(10000) / static_cast<double>(right - left + 1);
  double LowerSecondCase =
      static_cast<double>(10000) / static_cast<double>(right + 1);
  std::cin >> func_calls;
  for (int i = 0; i < func_calls; ++i) {
    std::cin >> left;
    std::cin >> right;
    if (left != right && left != 0) {
      std::cout << std::fixed << std::setprecision(10)
                << pow(product[right] / product[left - 1], LowerFirstCase)
                << "\n";
    } else if (left == right) {
      std::cout << std::fixed << std::setprecision(10) << arr[right] << "\n";
    } else if (left == 0) {
      std::cout << std::fixed << std::setprecision(10)
                << pow(product[right], LowerSecondCase) << "\n";
    }
  }
}
int main() {
  FindNoise();
  return 0;
}