1) We have 36 possible cases and 12 favourable cases: (1,1), (1,2), (1,2), (1,4), (1,5), (1,6), (2,1), (2,2), (2,3), (2,4), (2,5), (2,6).
So .
2) .
For : we have 15 favourable cases, so
For we have 2 favourable cases, so .
Then
The number showing on the upper faces when two fair six-sided dice are tossed is observed. Consider events A and B defined as:
A - the total score is at least 8
B - at least one die achieves a score of 2 or less
Find
1. P(B') (in 3 dec pl)
2. P(A or B) ( in 3 dec pl)
Thanks