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Express \(413_7\) to base 5

Mathematics
WAEC 2023

Express \(413_7\) to base 5

  • A. \(2311_5\)
  • B. \(1131_5\)
  • C. \(1311_5\)
  • D. \(2132_5\)
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Correct Answer: Option C
Explanation

\(413_7\) to base 5 

convert first to base 10

\(417_7 = 4 × 7^2 + 1 × 7^1 + 3 × 7^0\)
= 4 × 49 + 1 × 7 + 3 × 1
= 196 + 7 + 3

= \(206_{10}\)

convert this result to base 5

5 206
5 41R1
5 8R1
5 1R3
  0R1

\(∴ 413_7 = 1311_5\)
 


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