| 7 | 49 | 7 | 98 |
| 9 | 81 | 9 | 162 |
| 6 | 36 | 6 | 72 |
| 5 | 25 | 5 | ? |
A) 80
B) 65
C) 60
D) 50
E) None of these
Correct Answer: D
Solution :
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