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

(31, 26, 155)

(18, 12, 108)

(NOTE : Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits. E.g. 13 - Operations on 13 such as adding /deleting /multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is NOT allowed.)

(17, 9, 136)

Logic  is :

First - second number = X ; X × First number  = Third number.

(31, 26, 155)

  31 - 26 = 5;  5 × 31 = 155

(18, 12, 108)

18 - 12 = 6; 6 × 18 = 108

Similarly,

(17, 9, 136) 

17 - 9 = 8; 8 × 17 = 136 → Follows the pattern

Hence, (17, 9, 136) is the correct answer.