What is the probability of drawing two pink marbles if the first one is placed back in the back before the second drawer

Answer 1

The answer depends on how many other marbles are in the bag.

Let us say there are 10 marbles total in the bag.

There are 2 pink marbles and 8 other color marbles.

The probability of picking a pink marble on the first try is 2/10. Then replace the pink marble inside the bag, so there are 10 marbles again. The probability of getting a pink marble again is 2/10. You must multiply the probability of the first draw by the second draw.

For this example, you will multiple 2/10 * 2/10. The answer is 4/100, then reduce the ratio to 1/25.