Statistics of Measurement of the ratio of the production cross sections times branching fractions of Bc^(±) --> J /PSI PI± and B^(±) --> J /PSI K± and BR (Bc^(±) --> J /PSI π± π± π∓ ) / BR (Bc^(±) --> J /PSI π± ) in pp collisions at sqrt{s}= 7 TeV