Two people choose at random a number between 1 and 6 ?

Which option gives the probability that the numbers will add up to 3.





a. 1/36


b. 1/18


c. 1/12


d. 1/9


e. 1/6


f. 1/4

Two people choose at random a number between 1 and 6 ?
Well, the only possibilities are 1 and 2 or 2 and 1. This is two out of 36 total possibilities, so the answer is B, 1 in 18.
Reply:b





1/18
Reply:1/18
Reply:It can either be 1 and 2


P(1n2)=1/6 x 1/6


=1/36


or 2 and 1


P(2n1)=1/6 x 1/6


=1/36


So P(1n2 u 2n1)=1/36 + 1/36


=1/18


So b