Question 359703
a) 
1-.28=.72 don't play.
.72^12=.0194
.
b)
expand (x+y)^12
x^12+12x^11y+66x^10y^2+220x^9y^3+495x^8y4 |x=.72 y=.28
=.7746
.
c)
1-.7746=.2254
.
I'll leave d up to you.
.
Ed