Select the set in which the numbers are related in the same way as are the numbers of the following sets.

(11, 22, 44) (15, 12, 42)

(18, 8, 44)

(11, 22, 44) (15, 12, 42)

The logic followed here is :

(IIIrd number - IInd number) ÷ 2 

As

(44 - 22) ÷ 2

22 ÷ 2  = 11

And

( 42 - 12 ) ÷ 2 

30 ÷ 2

15

Similarly

(18, 8, 44)

( 44 - 8 ) ÷ 2

36 ÷ 2  = 18