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- package javaSE;
- import java.util.Scanner;
- public class tinh_tong {
- public static void main(String[] args) {
- Scanner scanner = new Scanner(System.in);
- int n, sum = 0;
- do {
- System.out.println("Nhập số phần tử:");
- n = scanner.nextInt();
- } while (n <= 0);
- for (int i = 1, j = 1; i <= n; i++, j += 4) {
- sum += j;
- }
- System.out.println("Tổng S: " + sum);
- }
- }
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