| Line 3: | Line 3: | ||
a) | a) | ||
(i) P(one lost on A,one lost on B)=2!(1/5)(1-1/5)(1/16) | (i) P(one lost on A,one lost on B)=2!(1/5)(1-1/5)(1/16) | ||
| + | |||
(ii) P(both lost on B)=[(1-1/5)^2]*(1/16) | (ii) P(both lost on B)=[(1-1/5)^2]*(1/16) | ||
| + | |||
(iii) P(both lost on A)=(1/5)^2 | (iii) P(both lost on A)=(1/5)^2 | ||
I don't really understand the solutiong they give, but i dont really think the solution for a)[ii] is correct. The P for one case lost in B is 1/16, how can lost both in B even higher than lost one? | I don't really understand the solutiong they give, but i dont really think the solution for a)[ii] is correct. The P for one case lost in B is 1/16, how can lost both in B even higher than lost one? | ||
Revision as of 16:51, 24 September 2008
For problem 2 I think a) (i) P(one lost on A,one lost on B)=2!(1/5)(1-1/5)(1/16)
(ii) P(both lost on B)=[(1-1/5)^2]*(1/16)
(iii) P(both lost on A)=(1/5)^2
I don't really understand the solutiong they give, but i dont really think the solution for a)[ii] is correct. The P for one case lost in B is 1/16, how can lost both in B even higher than lost one?
