Question

There is a bag filled with 4 blue, 3 red and 5 green marbles. A marble is taken at random from the bag, the colour is noted and then it is replaced.

Another marble is taken at random.
What is the probability of getting 2 reds?

Answer 1

The probability of both happening is 3/7 times 2/6, or 6/42, or 1/7. There is a bag filled with 3 blue 4 red and 5 green marbles. A marbel is taken at random from the bag, the colour is noted and then it is replaced.

Explanation: