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| 9 | 7 | 6 |
| - 1 | - 7 | - 3 |

| $(a)$ | $4$ | $2$ | $9$ | $6$ |
| $(b)$ | $12$ | $5$ | $10$ | $19$ |
| $(c)$ | $7$ | $10$ | $20$ | $15$ |
| $(d)$ | $3$ | $11$ | $13$ | $1$ |

| ૩ | ૮ | ૬ |
| - ૧ | - ૫ | - ૧ |

| $2$ $+ 7$ |
| $1$ $+ 8$ |
| $4$ $+ 2$ |
| 4 | 9 | 2 |
| - 2 | - 3 | - 1 |