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For a matrix $M=[m_{ij}]; \: i,j=1,2,3,4$, the diagonal elements are all zero and $m_{ij}=-m_{ji}$. The minimum number of elements required to fully specify the matrix is ________

  1. $0$
  2. $6$
  3. $12$
  4. $16$
in Numerical Ability 2.7k points
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