Question
| K | $3$ | $6$ | $9$ | $12$ | $15$ | $18$ |
| $\frac{k}{3}$ | $1$ | $2$ |
✓
Answer
| 6 | ||||||
| K | 3 | 6 | 9 | 12 | 15 | 18 |
| $\frac{k}{3}$ | 1 | 2 | 3 | 4 | 5 |
$\frac{k}{3}=5$
$k=15$
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