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- // Tinh S1 = 1^2 + 3^2 + 5^2 + 7^2 + … + (2n + 1)^2
- // Khai bao thu vien neu co
- #include<stdio.h>
- #include<conio.h>
- void main()
- {
- int n;
- scanf("%d",&n);
- long s=0;
- for(int i=0;i<=n;i++)
- {
- s=s+((2*i)+1);
- }
- printf("%ld",s);
- }
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