Camila sets up a passcode on her tablet, which allows only five-digit codes. She hasheard that it's more secure if a digit is repeated in the passcode. A spy sneaks a look atCamila's tablet and sees her fingerprints on the screen over four numbers. What is theprobability the spy is able to unlock the tablet on his first try? Express your answer as afraction in lowest terms or a decimal rounded to the nearest millionth.

Camila sets up a passcode on her tablet, which allows only five-digit codes. She hasheard that it's more secure if a digit is repeated in the passcode. A spy sneaks a look atCamila's tablet and sees her fingerprints on the screen over four numbers. What is theprobability the spy is able to unlock the tablet on his first try? Express your answer as afraction in lowest terms or a decimal rounded to the nearest millionth.

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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Question

Camila sets up a passcode on her tablet, which allows only five-digit codes. She has
heard that it's more secure if a digit is repeated in the passcode. A spy sneaks a look at
Camila's tablet and sees her fingerprints on the screen over four numbers. What is the
probability the spy is able to unlock the tablet on his first try? Express your answer as a
fraction in lowest terms or a decimal rounded to the nearest millionth.

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