Explanation :
In this problem the given series follows the following pattern of (11 + 4n)2 where n = 0, 1, 2, 3, ... i.e.
1st term = (11 + 4 x 0)2 = 112 = 121
2nd term = (11 + 4 x 1)2 = 152 = 225
3rd term = (11 + 4 x 2)2 = 192 = 361
4th term = (11 + 4 x 3)2 = (23)2 = 529
So, the missing term is 529.