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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)