Which one will replace the question mark?

49	100	64
9	36	4
81	1	25
19		15

Logic: $$\sqrt {1st column}$$ + $$\sqrt {2nd column}$$ + $$\sqrt {3rd column}$$ = Lower column

For, 1st

= $$\sqrt {49}$$ + $$\sqrt {9}$$ + $$\sqrt {81}$$ ​

= 7 + 3 + 9

= 19

For, 3rd 

= $$\sqrt {64}$$ + $$\sqrt {4}$$ + $$\sqrt {25}$$​​

 = 8 + 2 + 5

= 15

Similarly,

For, 2nd

= $$\sqrt {100}$$ + $$\sqrt {36}$$ + $$\sqrt {1}$$

= 10 + 6 + 1

=  17

Thus, correct option is (c).