| 4 | 5 | 6 | 5 |
| 6 | 7 | 8 | 21 |
| 3 | 7 | 7 | 9 |
| 5 | 7 | ? | 10 |
A) 8
B) 6
C) 9
D) 10
E) None of these
Correct Answer: A
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