| 5 | 11 | 64 |
| 11 | 3 | ? |
| 21 | 9 | 225 |
A) 36
B) 64
C) 49
D) 81
Correct Answer: B
Solution :
\[{{\left[ \frac{1}{2}(11+3) \right]}^{2}}=49\]
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