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Let a Be the Set of All Strings of Decimal

Question 1

Short Answer

Let A be the set of all strings of decimal digits of length 5. For example, 00312 and 19483 are two strings in A. You pick a string from A at random. What is the probability that (a) the string begins with 7575. (b) the string has no 4 in it.

Correct Answer:

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