Question

Find P(both odd numbers).

one-ninth
one-fourth
one-third
four-ninths

The two numbers rolled can be added to get a sum. Find P(sum is even).

one-fourth
fifteen over thirty-six
one-half
three-fourths

Answer 1

The sample space for a roll of two number cubes is shown in the table.

Answer 2

@amistre64

Answer 3

its just a matter of counting

Answer 4

how many pairs of odd number are in the table?

Answer 5

Half the table would be odd? so 15.

Answer 6

not quite

Answer 7

1 1
1 3
1 5
3 1
3 3
3 5
5 1
5 3
5 5

i COUNT .... 9 pairs of odd

now how many pairs make up the sample space?

Answer 8

I'm Not sure. i suck at math :( I was great in-till the end of the year i Got stuck on some stuff.

Answer 9

6 rows, 6 columns ... what is 6 times 6 ?

Answer 10

36.

Answer 11

then there are 36 elements in the sample space; 9 of which are odd paired; that gives us:

9/36 and simplify as wanted

Answer 12

Divide both the numerator and denominator by 9 and you get:

1/4 or 1 over 4 or 0.25

1/4 is the fraction in simplest form.

Answer 13

then thats the answer for the first one

Answer 14

Thanks!

Answer 15

for the second one; it might be good to know that odd + even is odd; so rule out all the odd even pairs .... or only count the odd odd, even even pairs

Answer 16

we already know there are 9 odd odd pairs; and if we count the even even pairs ... we get another 9

we know that there are 36 elements in the sample space

(9+9)/36

Answer 17

The answer is one-half

Answer 18

correct