Let A = {1, 2, 3, 4, 5, 6, 7}. How many symmetric relations on A contain

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Let A = {1, 2, 3, 4, 5, 6, 7}. How many symmetric relations on A contain exactly
(a) Four ordered pairs?
(b) Five ordered pairs?

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Discrete and Combinatorial Mathematics An Applied Introduction

ISBN: 978-0201726343

5th edition

Authors: Ralph P. Grimaldi

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Question Posted: Jun 21, 2016 08:31 AM

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Let A = {1, 2, 3, 4, 5, 6, 7}. How many symmetric relations on A contain

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Discrete and Combinatorial Mathematics An Applied Introduction

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