Question

PLEASE HELP, I GOT A FINAL EXAM... in 3 weeks :)

A math teacher is randomly distributing 15 black dry erase markers and 6 blue dry erase markers. What is the probability that the first marker handed out will be blue and the second marker will be black?

Answer 1

There are 21 markers in total. The probability of handing out a blue marker first is 6/21. If a blue marker is the first to be handed out, there are 20 markers remaining of which15 are black. Therefore the probability of a black marker being the second to be handed out is 15/20. the required probability is therefore given by:
\[\large \frac{6}{21} \times \frac{15}{20}=you\ can\ calculate\]

Answer 2

@Romwil Do you understand?

Answer 3

I'm stupid
I got that, but I did 15/21 * 6/21
I didn't read
lol thx I owe you one

Answer 4

You're welcome :)