(a) Find the sum of the digits in each of your products in part (a). If the...
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(a) Find the sum of the digits in each of your products in part (a). If the sum is not a one-digit number, find the sum of the digits of the resulting sum again until you obtain a one-digit number.
(b) Make a conjecture about the sum of the digits when a one- or two-digit number is multiplied by 9.
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Related Book For
A Survey of Mathematics with Applications
ISBN: 978-0134112107
10th edition
Authors: Allen R. Angel, Christine D. Abbott, Dennis Runde
Question Posted:
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