A) 16
B) 25
C) 36
D) 49
E) None of these
Correct Answer: C
Solution :
?Logic is double the square root of the sum of the outer four numbers i.e. \[2x\text{ }{{\left( 19+21+13+11 \right)}^{\frac{1}{2}}}\text{ }=2\times 8=16\]
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