In the following question, find the number that will come in place of question mark from the given options.

Given: 

Logic: (1st row + 2nd row) $$\div$$ 2 = (Number)²= 3rd row

For, 2nd column

25 + 15 = 40 $$\div$$​ 2 = 20, 20²= 400

For, 3rd column

​40 + 20 = 60 $$\div$$​ 2 = 30, 30²= 900

Similarly,

1st column

16 + 10 = 26 $$\div$$  2 = 13, 13²= 169

The missing number is 169.

Thus, correct option is (b).