Do I have the calculations correct? 83% of kidney transplant patients treated with cyclosporine survive. Hospital performs 4 kidney transplants and all treated with cyclosporine. I calculated P (survive) = .83 so P (not survive) - .17. Probability that all 4 survive = (.83) to the 4th power or .47458321 so 1 - .47458321 = .52541679. Probability that none survive would be same formula but ( .17) to the 4th power = .00083521 so 1 - .00083521 = .99116479. Probability that at least one survives = (.83) (.17) to the 4th power = .004913 so 1 - .004913 = .995087