You're right of course. Too early in the morning and mixing up n + n-1 + n-2 ... with n * n-1 * n-2 ....
It should be O((N-1)*N/2). Corrected. Thanks.
With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
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In the absence of evidence, opinion is indistinguishable from prejudice.