Re:I cheated on my Microsoft interview (2019)
by visarga on Sunday June 05, 2022 @07:33AM
(#31630001)
I learned this formula before high school. It was considered trivial.
The demonstration was to write the sums 1+2+...N and N+(n-1)+...+1 and add them up position wise. The sum comes n*(n+1)/2 (divide by 2 for the two sums).
The demonstration was to write the sums 1+2+...N and N+(n-1)+...+1 and add them up position wise. The sum comes n*(n+1)/2 (divide by 2 for the two sums).