a. Seven people are standing in a row. How many ways can they permute themselves so that at most two of them are in their original positions after the switch? b. How many ways can we place three non- attacking rooks on the following board?

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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Please please answer both a and b with explanation

I will provide you positive response

Thanks

Answer the following questions;
a. Seven people are standing in a row. How
many ways can they permute themselves so
that at most two of them are in their original
positions after the switch?
b. How many ways can we place three non-
attacking rooks on the following board?
Transcribed Image Text:Answer the following questions; a. Seven people are standing in a row. How many ways can they permute themselves so that at most two of them are in their original positions after the switch? b. How many ways can we place three non- attacking rooks on the following board?
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