Question

(No links please) There were 2 red marbles, 3 blue marbles and 5 gold marbles in a bag.

You pulled out 1 red marble and did not replace it. Find the probability of drawing a gold marble next.

Answer 1

5/9

Explanation:

You started with 10 marbles total. You removed one marble and did not replace it, so you now have 9 marbles. The marble that you removed was NOT a gold marble, so you still have 5 gold marbles.

This means that out of the 9 marbles that you have left, 5 of them are gold.

This means you have a 5/9 chance of drawing a gold marble next.