1.

Two fair dice are rolled. Let P(A_(i))gt0 donete the event that the sum of the faces of the dice is divisible by i. The number of all possible ordered pair (I,j) for which the events A_(i) and a_(j) are independent is

Answer»

6
12
13
25

Solution :Note that `A_(1)` is independent with all events `A_(1),A_(2),A_(3),A_(4)....,A_(12),` Now, total NUMBER of ORDERED pairs is 23.
`underset(22)( underbrace((1.1),(1,2),(1.3),...,(1,11)))+(1,12)`
ALSO that `A_(2),A_(3),andA_(3),A_(2)` are independent. Hence, there are 25 ordered pairs.


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