Solution
In each row, the square of the sum of the first and second numbers of each row will make the third number.
Row 1 :
$$(6+7)^2 = 13^2 = 169$$
Row 3 :
$$(10+9)^2 = 19^2 = 361$$
Row 2 :
$$(8+3)^2 = 11^2 = 121$$
Hence 121 will come in place of the question mark.
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