Question

help needed
http://prntscr.com/109aiy

Answer 1

iam confused with part a

Answer 2

I don't know what A is

Answer 3

if A represents an event of rolling,then 1/2A does not make any sense...is it probability of A or P(A) in that expression?

Answer 4

if you work it out you get 1/4 aa +1/2 ab + 1/4 bb
it doesn't make very much sense.

Answer 5

oh. it's the probability of rolling each combination with the given number cubes

Answer 6

its probability of A ..
then its essentially 1/2
so when i put that,it becomes (1/2(1/2)+1/2(1/2))^2=(1/2)^2=1/4

Answer 7

We are missing something I think..

Answer 8

Besides, the two events of one cube showing 2,3 or 4 and other showing 1,5 or 6 are mutually independent .
so P(A and B ) will be just P(A)*P(B)=1/2*1/2=1/4

Answer 9

it's not really supposed to equal anything, it just gives the probability of rolling each combination

Answer 10

1/4 of the square is aa
1/2 of the square is ab
1/4 of the square is bb

Answer 11

By simplifying (1/2A+1/2B)^2 for u above to get it as 1/4 ,
(1/2(1/2)+1/2(1/2))^2=(1/2)^2=1/4 ......

Answer 12

And the two events of one cube showing 2,3 or 4 and other showing 1,5 or 6 are mutually independent.
so P(A and B ) will be just P(A)*P(B)=1/2*1/2=1/4

Answer 13

for part a, you aren't asked to find anything, just to simplify. so it is 1/4 aa +1/2 ab + 1/4 bb

Answer 14

it makes sense because it contains the information required to find the next part of the question

Answer 15

@LilySwan on a scale of 1 to 10, how confused are you?