Your television remote control has buttons for digits 09. If you press two buttons, how many numbers

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Your television remote control has buttons for digits 0–9. If you press two buttons, how many numbers are possible if 

(a) The same button may be pressed twice. 

(b) The same button may not be pressed twice.

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Related Book For  book-img-for-question

A Survey of Mathematics with Applications

ISBN: 978-0134112107

10th edition

Authors: Allen R. Angel, Christine D. Abbott, Dennis Runde

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