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Paula moves to an area with a different telephone exchange. Telephone numbers in the new exchange start with 753, and all combinations of the four
Paula moves to an area with a different telephone exchange. Telephone numbers in the new exchange start with 753, and all combinations of the four remaining digits are equally likely.
a) Calculate the probability that the last four digits in Paula's new telephone number are odd digits.
b) What is the expected number of odd digits in her new telephone number?
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