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  1. Prepare
  2. Mathematics
  3. Algebra
  4. Number Groups
  5. Discussions

Number Groups

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  • v_28000
     + 0 comments
    ** Does anyone know why below code give wrong answer on some test cases**

    public static long sumOfGroup(int k) {

     long ele=(k*(k-1))+1;
long sum=(k*(2*ele+(k-1)*2))/2;
return sum;



}

  • hoangziet22
     + 0 comments
    def sumOfGroup(k):
        return k**3

  • MrDeeb
     + 0 comments

    seriuosly, Why does "k*k*K" solution work !?

    I mean what the math explaination behind this?

  • agritgarg
     + 0 comments
    

    // Return the sum of the elements of the k'th group.
long long int x=(k*(k-1)+1);
long long int sum=x;
for(int i=0;i<k-1;i++){
    x=x+2;
    sum+=x;
}

    return sum; }https://)

  • shivamaggarwal52
     + 0 comments

    For th group, how many number were used in previous groups?

    So, the first number in th group will be th odd number.

    th odd number is given as . So, the first number in th group will be

    Now, the group is an AP with first term given above and common difference (odd numbers).

    In C++, return 1L * k * k * k.