Question : Direction: In the following question, select the missing number from the given responses.
Option 1: 2
Option 2: 32
Option 3: 4
Option 4: 16
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Correct Answer: 16
Solution : Add the square root of the numbers given at the corners.
⇒ $\sqrt16\ +\sqrt25\ +\sqrt36\ +\sqrt49 = 4+5+6+7=22$
⇒ $\sqrt4\ +\sqrt9\ +\sqrt1\ +\sqrt81 = 2+3+1+9=15$
$⇒\sqrt9\ +\sqrt64\ +\sqrt1\ +\sqrt(X)=16$
$⇒3 +8 +1 +\sqrt(X)=16$
$⇒12 +\sqrt(X)=16$
$⇒\sqrt(X)=16-12 = 4$ $⇒X=4^2 = 16$
Therefore, 16 is the missing number.
Hence, the fourth option is correct.
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