Suppose that A, B, C, and D are digits from 1 to 9 and that A + B = CD (a) What digit must C be? Explain (b) Can D be 1? (c) If D = 7, what are the possible digits that A can be? (d) If A is six larger than B, what must D be?

Suppose that A, B, C, and D are digits from 1 to 9 and that A + B = CD (a) What digit must C be? Explain (b) Can D be 1? (c) If D = 7, what are the possible digits that A can be? (d) If A is six larger than B, what must D be?

Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

Problem 1RQ

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Question

Suppose that A, B, C, and D are digits from 1 to 9 and that
A + B = CD
(a) What digit must C be? Explain
(b) Can D be 1?
(c) If D = 7, what are the possible digits that A can be?
(d) If A is six larger than B, what must D be?

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