Question 341788
(a+b)^10=a^10+10a^9b+... Let a=.99 and b=.01
We don't need to go any farther with the expansion for this problem.
a) .99^10=.9043 None defective.
c) 1-.9043=.0956 at least one defective.
b) 
10*0.99^9*0.01=.0914 exactly one defective.
.9043+.0914=.9957 not more than 1 defective
.
Ed