To determine The flaw in the given proof of induction. Every postage of three cents or more can be formed using just three-cent and four-cent stamps Basis step: We can form postage of three cents with a single three cent stamp and we can form postage of four cents with a single four cent stamp. Inductive step: Assume that j cents for all nonnegative integers j with j k using just three and four cent stamps. We can then form postage of k + 1 cents by replacing one three cent stamp with a four cent stamp or by replacing two four-cent stamps by three three-cent stamps.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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**To determine**

The flaw in the given proof of induction.

**Problem**

Every postage of three cents or more can be formed using just three-cent and four-cent stamps.

**Basis step:** We can form postage of three cents with a single three-cent stamp and we can form postage of four cents with a single four-cent stamp.

**Inductive step:** Assume that *j* cents for all nonnegative integers *j* with *j* ≤ *k* can be formed using just three and four-cent stamps. We can then form postage of *k* + 1 cents by replacing one three-cent stamp with a four-cent stamp or by replacing two four-cent stamps by three three-cent stamps.
Transcribed Image Text:**To determine** The flaw in the given proof of induction. **Problem** Every postage of three cents or more can be formed using just three-cent and four-cent stamps. **Basis step:** We can form postage of three cents with a single three-cent stamp and we can form postage of four cents with a single four-cent stamp. **Inductive step:** Assume that *j* cents for all nonnegative integers *j* with *j* ≤ *k* can be formed using just three and four-cent stamps. We can then form postage of *k* + 1 cents by replacing one three-cent stamp with a four-cent stamp or by replacing two four-cent stamps by three three-cent stamps.
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