Find the last digit of the decimal (base 10) expansion of 32823

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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**Problem Statement:**

Find the last digit of the decimal (base 10) expansion of \(3^{2823}\).

**Explanation:**

We need to determine the last digit of the number when expressed in base 10. This is equivalent to finding \(3^{2823} \mod 10\).

For problems like these, we can observe the pattern in the last digits of successive powers of 3:

- \(3^1 = 3\) (last digit is 3)
- \(3^2 = 9\) (last digit is 9)
- \(3^3 = 27\) (last digit is 7)
- \(3^4 = 81\) (last digit is 1)
- \(3^5 = 243\) (last digit is 3)
  
Notice that the last digits repeat every 4 terms: 3, 9, 7, 1.

Since the pattern repeats every 4 numbers, we can find the position in the cycle by calculating \(2823 \mod 4\).

\(2823 \div 4 = 705\) remainder \(3\).

Thus, \(3^{2823}\) corresponds to the third position in the cycle, which has a last digit of 7. 

Therefore, the last digit of \(3^{2823}\) is 7.
Transcribed Image Text:**Problem Statement:** Find the last digit of the decimal (base 10) expansion of \(3^{2823}\). **Explanation:** We need to determine the last digit of the number when expressed in base 10. This is equivalent to finding \(3^{2823} \mod 10\). For problems like these, we can observe the pattern in the last digits of successive powers of 3: - \(3^1 = 3\) (last digit is 3) - \(3^2 = 9\) (last digit is 9) - \(3^3 = 27\) (last digit is 7) - \(3^4 = 81\) (last digit is 1) - \(3^5 = 243\) (last digit is 3) Notice that the last digits repeat every 4 terms: 3, 9, 7, 1. Since the pattern repeats every 4 numbers, we can find the position in the cycle by calculating \(2823 \mod 4\). \(2823 \div 4 = 705\) remainder \(3\). Thus, \(3^{2823}\) corresponds to the third position in the cycle, which has a last digit of 7. Therefore, the last digit of \(3^{2823}\) is 7.
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