Q. 24.3( 3 Votes )

Prove that is throwing a pair of dice, the occurrence of the number 4 on the first die is independent of the occurrence of 5 on the second die.

Answer :

We are throwing two dice so,


Sample space S={(1,1),(1,2),(1,3),(1,4),(1,5),(1,6),


(2,1),(2,2),(2,3),(2,4),(2,5),(2,6),


(3,1),(3,2),(3,3),(3,4),(3,5),(3,6),


(4,1),(4,2),(4,3),(4,4),(4,5),(4,6),


(5,1),(5,2),(5,3),(5,4),(5,5),(5,6),


(6,1),(6,2),(6,3),(6,4),(6,5),(6,6)}


Sample space contains 36 elements,


A= Number four appears on first die


A={(4,1),(4,2),(4,3),(4,4),(4,5),(4,6)}



B=Number 5 on second die


B={(1,5), (2,5), (3,5),(4,5),(5,5),(6,5)}



P(AB)={(4,5)}





Therefore A and B are independent events


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