✔ 最佳答案
1a.v1:v2:v3
=1/3兀r^2x2r : 4/3兀r^3 : 兀r^2x2r
=r/3 : 4/3 : r
=r:4:3r
1b.v1 :v2 :v3
=1/3兀r^2x4r : 2x4/3兀r^3 : 4兀r^3
=1/3 : 2/3 : 1
=1:2:3
2a.期望值
=20x5/18+2x13/18
=7
由於7>5
所以對參加者有利
b.71st2nd12345611,1=22,1=33,1=44,1=55,1=66,1=721,2=32,2=43,2=54,2=65,2=76,2=831,3=42,3=53,3=64,3=75,3=86,3=941,4=52,4=63,4=74,4=85,4=96,4=1051,5=62,5=73,5=84,5=95,5=106,5=1161,6=72,6=83,6=94,6=105,6=116,6=12