test2

\left( \sum_{k=1}^n a_k b_k \right)^2 \leq \left( \sum_{k=1}^n a_k^2 \right) \left( \sum_{k=1}^n b_k^2 \right)

 

 

  P_{\lambda}\,(X^{j}=a_{ij}|Y=c_{j})