p 1=46×25=830。
(ii) Probability of taking out at least one red ball:
p2= 1-C34C36=45。
(iii) The possible value of ξ is 0. 1.2,
P(ξ=0)=C34C36= 15,
p(ξ= 1)= c 12c 24 c 36 = 35,
p(ξ= 2)= c22c 14c 36 = 15,
∴ξdistribution ranking is:? ξ? 0? 1? 2? p? 15? 35? 15eξ= 0× 15+ 1×35+2× 15 = 1。
The famous saying of "Mathematics 10" is: Mathematics is an evolutionary culture, mathematics is all kinds of proof skills, and mathematics is the highest form of k