Suppose you start with z 1 and append digits to the end of z, each chosen mutually independently and uniformly at random from [0..9). You repeat this process until z is even or z has 6 digits. What is the expected number of digits in z at the end of this process? 5.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter10: Sequences, Series, And Probability
Section10.8: Probability
Problem 31E
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1 and append digits to the end of z, each chosen mutually
independently and uniformly at random from [0..9]. You repeat this process until z is even or
5.
Suppose you start with z =
z has 6 digits. What is the expected number of digits in z at the end of this process?
For example, one possible instance of this process would be
1 17 173 1731 17310,
at which point the process stops because z = 17310 is even.
Transcribed Image Text:1 and append digits to the end of z, each chosen mutually independently and uniformly at random from [0..9]. You repeat this process until z is even or 5. Suppose you start with z = z has 6 digits. What is the expected number of digits in z at the end of this process? For example, one possible instance of this process would be 1 17 173 1731 17310, at which point the process stops because z = 17310 is even.
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