$\nchoosek{n}{k}$\sum_{1\leq i < j \leq n }^n={n\choose{2}}=n(n-1)/2Discover more from Master the Math
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$\nchoosek{n}{k}$\sum_{1\leq i < j \leq n }^n={n\choose{2}}=n(n-1)/2Subscribe to get the latest posts sent to your email.