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- #include <iostream>
- #include <conio.h>
- int main() {
- int n;
- std::cout << "Podaj n:\n";
- std::cin >> n;
- double licznik = (n*(n+1))/2;
- double m = 1;
- for (int i = 0; i < n; ++i) {
- m = m*(2 + (i * 4));
- }
- std::cout << licznik / m;
- _getch();
- return 0;
- }
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