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A hat contains a number of cubes 15 red 10

A hat contains a number of cubes: 15 red, 10 white, 5 blue, and 20 black. One cube is chosen at random. What is the probability that it is?

a. A red cube?

b. Not a red cube?

c. A cube that is white OR black?

d. A cube that is neither white nor black?

e. What do the answers to part a and part b add up to and why?

a. A red cube?

b. Not a red cube?

c. A cube that is white OR black?

d. A cube that is neither white nor black?

e. What do the answers to part a and part b add up to and why?

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