Formula for n*n Grid's square sum :{ n*(n+1)*(2n+1) }/6
Formula for n*m Grid's Rectangle sum : { n*(n+1) /2 }^2
URI -- 1323 (Feynman)
Solution :
Formula for n*n Grid's square sum :{ n*(n+1)*(2n+1) }/6
Formula for n*m Grid's Rectangle sum : { n*(n+1) /2 }^2
Formula for n*n Grid's square sum :{ n*(n+1)*(2n+1) }/6
Formula for n*m Grid's Rectangle sum : { n*(n+1) /2 }^2
