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Gina has a box of pens that contains 10 red pens, 8 blue pens, and 2 green pens. She will randomly take out a pen, write down the color, and put the pen back into the box. What is the probability that Gina will pull two red pens in a row?

Answer :

10 red

8 blue

2 green

Total number = 20

Probability that Gina takes a red pen = number of red pens divided by the total = 10/20 = 0.5 = 50%

If she repeats the event, the second time the probability is the same: 0.5 = 50%

Probability of two events = probability of the first one multiplied by the probability of the second = 0.5 x 0.5 =0.25 = 25%

Answer:

Probability = 0.25 = 25%

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Rewritten by : Brahmana