The way the items are ordered now you can see that each of those pairs is equal to N (N11 is N, N22 is N) Since there are N1 items, there are (N1)/2 such pairs So you're adding N (N1)/2 times, so the total value is N*(N1)/2
Sum of series 1+2+3+4+....+n formula-The sum of the powers of two is one less than the product of the next power Don't take my word for it Try it with a larger valueFormula for the sum 1 2 2 2 3 2
Sum of series 1+2+3+4+....+n formulaのギャラリー
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