20
15
14
12
Correct answer is A
\(12_{12} = 1 \times 12^{1} + 2 \times 12^{0} = 12 + 2 = 14_{10}\)
| 7 | 14 |
| 7 | 2 rm 0 |
| 0 rm 2 |
\(\therefore 12_{e} = 20_{7}\)
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