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Feng Qi, Qing Zou, Bai-Ni Guo, THE INVERSE OF A TRIANGULAR MATRIX AND SEVERAL IDENTITIES OF THE CATALAN NUMBERS, Applicable Analysis and Discrete Mathematics, Vol. 13, No. 2 (October 2019), pp.

A simpler formula is obtained for Pederson's procedure of sampling from a multinomial population. An explicit formula of the Moore-Penrose inverse of the variance-covariance matrix is given as well as ...