If the probability that a fulurorescent light has a useful life of a least 800 hours is 0.9 find the probability that among 20 such lights at least 2 will not have a useful life of at least 800 hours. [ Given `(0.9) = 0.1348 ] `
A. `1-(2.9)(0.9)^20`
B. `1-(0.9)(2.9)^20`
C. `1-(2.9)(0.9)^19`
D. `1-(2.9)(0.9)^19`
