Question

A pair of fair dice is tossed. Given that the sum is 6, find the probability that one of the dice shows 2. (Hint: Possible pairs to achieve a 6, (1, 5), (2, 4), …)

Answer 1

2/5

Answer 2

may i know how did you get the answe ? thank you !

Answer 3

P(A|B) = P(A U B)/ P(B)

= 2/36 / 5 / 36
= 2/5

Answer 4

got it??

Answer 5

erm . how did you get 2/36 and 5/36 ?

Answer 6

P (A U B) means the probability of getting a 2 on one of the dice when uve got a six as the sum

now the cases are (2,4) and (4,2) so only 2 cases out of 36

and the cases of getting sum 6 are 5/36
so

Answer 7

another way of doing it is

Answer 8

how maqny points give a sum of 6?

Answer 9

?

Answer 10

3 ways

Answer 11

5 ways

1,5
5,1
3,3
2,4
4,2

Answer 12

oh ya.

Answer 13

so now out of these 5, how many cases r there in which theres a 2 on either die?

Answer 14

2

Answer 15

so there u go

2/5

Answer 16

okay thanks a lot !!! i get it !

Answer 17

and as an aside: I believe its:

P(A|B) = P(AnB)/P(B)