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A system consists of n identical particles each of mass m. The total number of interactions possible is |
n(n + 1) $\frac{1}{2} n(n+1)$ n(n - 1) $\frac{1}{2} n(n-1)$ |
$\frac{1}{2} n(n-1)$ |
Total number of interactions = ${ }^n C_2=\frac{n(n-1)}{2}$ |
