Question

Jessie draws a marble from the bag shown and then, without replacing the first marble,

he draws a second one.
Which expression shows the probability that he drew a red marble both times?
O 3/10 3/10
O3/10 3/9
3/10 2/10
O3/102/9

Answer 1

3/10 times 2/9 I don’t know

Answer 2

Last choice:

3/10 · 2/9

Explanation:

The total number of marbles and the number of red marbles is not provided but only one answer fits the problem solution

3/10 x 2/9 which is the last choice

It can be deduced that there are 10 marbles totally and 3 of them are red

The probability of a red marble on first draw = 3/10

After the first draw given a red marble was drawn, there are 2 red marbles and total of marbles so the probability of a second red marble = 2/9

The combined probability is 3/10 x 2/9