There are 3 white marbles and 7 blue marbles in a bag. Jamie will randomly pick two marbles out of the bag without replacing the first marble chosen. What is the probability of Jamie picking two blue marbles?
i don't understand probability

Question

There are 3 white marbles and 7 blue marbles in a bag. Jamie will randomly pick two marbles out of the bag without replacing the first marble chosen. What is the probability of Jamie picking two blue marbles?
i don't understand probability

amistre64 · Answer

what is the probabiility of getting a blue AND a blue

anonymous · Answer

7/10

amistre64 · Answer

7/10 is the probability of the first draw; assume a blue is drawn, whats the probability of pulling another blue now?

anonymous · Answer

6/9? x.x cause it does not replace

amistre64 · Answer

good

now when we and probabilities, its just multiplication for the most part

amistre64 · Answer

7/10  *   6/9

anonymous · Answer

oh. ! tysm . is it 7/15

amistre64 · Answer

thats seems about right :)

anonymous · Answer

thanks. i really appreciate your help!

amistre64 · Answer

theres a fancier way of trying to work out combinations and permutations, but that seems to complicate a rather simple process to start with

amistre64 · Answer

good luck