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Advanced Engineering Mathematics
10th Edition
ISBN: 9780470458365
Author: Erwin Kreyszig
Publisher: Wiley, John & Sons, Incorporated
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
Transcribed Image Text:**Title: Calculating the Greatest Common Divisor Using the Euclidean Algorithm**
**Problem Statement:**
6. Use the Euclidean algorithm to find \(\text{gcd}(825, 315)\).
**Solution:**
The Euclidean algorithm is an efficient method for computing the greatest common divisor (GCD) of two numbers. It is based on the principle that the GCD of two numbers also divides their difference. To find the GCD using the Euclidean algorithm, follow these steps:
1. **Divide 825 by 315** to find the remainder.
- \(825 \div 315 = 2\) remainder \(195\)
- Expressed in terms of GCD: \(\text{gcd}(825, 315) = \text{gcd}(315, 195)\)
2. **Divide 315 by 195**.
- \(315 \div 195 = 1\) remainder \(120\)
- Update the expression: \(\text{gcd}(315, 195) = \text{gcd}(195, 120)\)
3. **Divide 195 by 120**.
- \(195 \div 120 = 1\) remainder \(75\)
- Update the expression: \(\text{gcd}(195, 120) = \text{gcd}(120, 75)\)
4. **Divide 120 by 75**.
- \(120 \div 75 = 1\) remainder \(45\)
- Update the expression: \(\text{gcd}(120, 75) = \text{gcd}(75, 45)\)
5. **Divide 75 by 45**.
- \(75 \div 45 = 1\) remainder \(30\)
- Update the expression: \(\text{gcd}(75, 45) = \text{gcd}(45, 30)\)
6. **Divide 45 by 30**.
- \(45 \div 30 = 1\) remainder \(15\)
- Update the expression: \(\text{gcd}(45, 30) = \text{gcd}(30, 15)\)
7. **Divide 30 by 15**.
- \(30 \div 15 = 2\) remainder \(0\)
When
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