Question

12) A bag contains 3 red marbles, 4 black

marbles, and 5 yellow marbles. What are the
chances of picking a marble that is not black?

Answer 1

3+ 4 + 5 = 12

So the chance of picking a marble that is not black is minus it

3+5 = 8 marbles are not black

Take 8 divided to the whole number which is 12

8/12= 66%


Hope this helps!

Answer 2

`|\Omega|=3+4+5=12\\|A|=3+5=8\\\\P(A)=(8)/(12)=(2)/(3)\approx66.7\%`