How many 10-digit telephone numbers use only the digits 1, 3, 5 and 7, with each digit

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How many 10-digit telephone numbers use only the digits 1, 3, 5 and 7, with each digit appearing at least twice or not at all?

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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 08:43 AM

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How many 10-digit telephone numbers use only the digits 1, 3, 5 and 7, with each digit

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Discrete and Combinatorial Mathematics An Applied Introduction

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