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A digit is selected at random from eithe...

A digit is selected at random from either of the two sets {1, 2, 3, 4, 5, 6, 7, 8, 9} and {1, 2, 3, 4, 5, 6, 7, 8, 9}. What is the chance that the sum of the digits selected is 1 0?

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The correct Answer is:
`(1)/(9)`
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