Question

mary has a bag which contains 5 green marbles, 7 red marbles, and 9 blue marbles. without looking what is the probability of her pulling a red or a green marble

Answer 1

12/21

Answer 2

4/7

Answer 3

hkj

Answer 4

[AI-generated answer — Explain Bot]

To calculate the probability of pulling a red or a green marble without looking, we need to find the total number of favorable outcomes and the total number of possible outcomes.

First, let's find the total number of favorable outcomes, which is the sum of the number of green marbles and the number of red marbles. In this case, Mary has 5 green marbles and 7 red marbles, so the total number of favorable outcomes is 5 + 7 = 12.

Next, let's find the total number of possible outcomes, which is the sum of the total number of marbles in the bag. In this case, Mary has 5 green marbles, 7 red marbles, and 9 blue marbles, so the total number of possible outcomes is 5 + 7 + 9 = 21.

Finally, we can calculate the probability by dividing the total number of favorable outcomes by the total number of possible outcomes:

Probability = Favorable Outcomes / Possible Outcomes

Probability = 12 / 21

Simplifying the fraction, we get:

Probability = 4 / 7

Therefore, the probability of Mary pulling a red or a green marble without looking is 4/7.