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Multiply matrices A and B of any sizes legally (no size compatibility requirment). What kind of matrix multiplication am I? Why erythrocytes have a light section in the middle? Let X1 & X2 have joint pmf p(x1, x2)=(x1x2)/36. 0 otherwise Find joint pmf of Y1=X1X2 and Y2=X2? How to test Petrol in blood? What is meant by anisotropic?