in a clinical trial, researcher found that a certain drug had a 8% chance of curing a known disease. if 15 people are know to have the disease what is the probability of at lease 2 being cured?

Please show me how it is solved. I am plugging the figures into my ti84 and solving at 90.90%. This is not correct, but cannot determine where I am making the error. P(2)=15!/(15-2)!*2! * (.0064*.3382)

P(2)=1.307674368e12/6227020800*2 (.00216448)

p(2)=420*.00216448

p(2)=.9090816 or 90.90%