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Sam writes down the numbers 1, 2, 3, ..., 99

 

(a) How many digits did Sam write, in total?

(b) Sam chooses one of the digits written down, at random.  What is the probability that Sam chooses a 0?

(c) What is the sum of all the digits that Sam wrote down?

 Mar 7, 2023
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I answered this question already here: https://web2.0calc.com/questions/counting_53870
 Mar 7, 2023

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