Question

A bag contains 5 red cubes and 7 white cubes. Celinda will select one cube, put it in her pocket, and then select a second cube.


Which expression gives the probability that she will select two red cubes?

Answer 1

@Michele_Laino @drawwithapurpose @AloneS

Answer 2

this is sampling without replacement.
How many cubes are there altogether? How many of them are red?
What is the theoretical probability of selecting a red cube?

Answer 3

12 all together 5 are red
so 5/12?

Answer 4

Yes. But now Celinda puts the first cube, a red one, in her pocket.
Answer my question again.

Answer 5

4/12?

Answer 6

But this gal kept one red cube in her pocket!

Answer 7

so it's not 4/12?

Answer 8

No. one red cube is in her pock. how many red cubes are left in the bag?

Answer 9

4
OH!!!! so 4/11

Answer 10

Could you help me with 1 more?

Answer 11

Right. Now, you have two independent events. The prob. of the first occurring is mult. by the prob. of the second occurring. Set this mult. up. What is your result?

Answer 12

5/12 to 4/11

Answer 13

The fruit basket at a summer camp contained 4 oranges and 5 apples. Carlos chose 1 piece of fruit at random from the basket and gave the fruit to his friend Duncan. Then Carlos reached in again and chose another piece of fruit at random for himself.

What is the probability that Duncan received an orange and that Carlos then received an apple? Express your answer in simplest form.

Answer 14

" 5/12 to 4/11" : did you multiply?

Answer 15

ya

Answer 16

@mathmale

Answer 17

could you walk me through the other question I posted

Answer 18

@mathmale

Answer 19

"" 5/12 to 4/11" : did you multiply?" What was your final result?