Correct Answer - Option 4 : 635
LOGIC: In a row;
(First Number)2 + (Second Number)2 + (Third Number)2 = Fourth Number
In Row 1:
82 + 92 + 112
= 64 + 81 + 121
= 266
In Row 2:
102 + 142 + 22
= 100 + 196 + 4
= 300
In Row 3:
152 + 72 + 192
= 225 + 49 + 361
= 635
Hence, "635" is the correct answer.