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Three digits are randomly chosen from {1,2,3,4,5,6,7} without replacement. a) What is the probability the number formed...

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Advance Math

Three digits are randomly chosen from {1,2,3,4,5,6,7} withoutreplacement.

a) What is the probability the number formed is 123 or 567?

b) What is the probability the number formed has first digit1?

c) What is the probability the number formed by the three digitsis greater than 520?

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