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A bag contains 4 red marbles and 6 blue marbles. What is the probability of picking a red marble or a blue marble? ​

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Answer:

P(red or blue) =  1

Step-by-step explanation:

There are 4 red and 6 blue marbles giving a total of 10 marbles in both colors

The events picking a red marble and picking a blue marble are mutually exclusive. You cannot pick a marble of both colors in one draw

Therefore:
P(red or blue) = P(red) + P(blue)

P(red) = number of red marbles/total number = 4/10

P(blue) =  number of blue marbles/total number = 6/10

P(red or blue) = 4/10 + 6/10 = 10/10 = 1

This is obvious because there are only two colors of marbles and the probability it will be either blue or red is 1 (certain to occur)

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