Question

you roll two fair dice. What is the probability of one of the dice showing 5 or the sum being at least 8

Answer 1

please help!

Answer 2

first...draw the dice combinations

(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)

got it?

Answer 3

i thought it was 20/36, but that was wrong

Answer 4

the probability of one of the dice showing 5 is (5,1) (5,2) (5,3) (5,4) (5,5) (5,6) so 6/36

then the probability of sum of 8 is (2,6) (3,5) (4,4) (5,3) (6,2) so 5/36

Answer 5

now add 6/36 + 5/36

Answer 6

what do you get?

Answer 7

11/36 is wrong

Answer 8

oh wait...

Answer 9

i forgot another 5/36

Answer 10

its 6/36+5/36+3/36

Answer 11

should be 6/36 + 6/36 + 5/36

Answer 12

no, cuz 3,5 and 5,3 is counted

Answer 13

17/36 is wrong

Answer 14

really?

Answer 15

yep

Answer 16

its 14/36?

Answer 17

yeah i think @pizzapi is right

Answer 18

3/36 because the others are already counted

Answer 19

14/36 is wrong

Answer 20

3/36 is wrong

Answer 21

no..that wasn't what i meant

Answer 22

this is bizarre. it should be 12/46 + 5/36....

Answer 23

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

Answer 24

ahh got it

11/36 + 5/36

Answer 25

so it should be 16/36

Answer 26

or 4/9

Answer 27

that is wrong.. i have unlimited trys so it tells me if i get it right or wrong

Answer 28

did you try 4/9?

Answer 29

ya

Answer 30

try 13/36

Answer 31

wrong

Answer 32

it was 19/36

Answer 33

ugh AT LEAST 8...didn't see that

11/36 + 15/36

should be 26/36

Answer 34

so should be 13/18

Answer 35

it was 19/36

Answer 36

how?

Answer 37

are you sure you asked the right question?

Answer 38

(1,5)
(2,5) (2,6)
(3,5) (3,6)
(4,4) (4,5) (4,6)
(5,1) (5,2) (5,3) (5,4) (5,5) (5,6)
(6,2) (6,3) (6,4) (6,5) (6,6)
Is 19 solutions out of 39.

Answer 39

*out of 36

Answer 40

ic, didn't read the "at least 8" part

Answer 41

Rough night @lgbasallote ?

Answer 42

but it says probability of one die being 5 or sum of at least 8 so that means it should be P(one die 5) + P(sum at least 8) right?

Answer 43

uh, minus P(one die 5 and sum at least 8)

Answer 44

P(A or B) = P(A) + P(B) - P(A and B)

Answer 45

hmm yeah. rough night