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If \(12_{e} = X_{7}\), where e = 12, find X.

Mathematics
JAMB 1989

If \(12_{e} = X_{7}\), where e = 12, find X.

  • A. 20
  • B. 15
  • C. 14
  • D. 12
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Correct Answer: Option A
Explanation

\(12_{12} = 1 \times 12^{1} + 2 \times 12^{0} = 12 + 2 = 14_{10}\)

7 14
7 2 rm 0
  0 rm 2

\(\therefore 12_{e} = 20_{7}\)

 


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