Three digits numbers are formed from the digits 1,2,3,4,5,6, then one number is selected What is the probability that the number is greater than 200 ?

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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Three digits numbers are formed from the digits 1,2,3,4,5,6, then one number is selected
What is the probability that the number is greater than 200 ?

3-letter code words are made using the first 8 letters of alphabet. One code is selected at random.
a) What is the probability that in this word all letters are different?
b) What is the probability that adjacent letters in the selected word are not alike?

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