Select the set in which the numbers are related in the same way as are the numbers of the following sets. (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 / subtracting / 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)

Q:

(15, 9, 4)
 (7, 2, 3)

• 1
  (21, 12, 6)
• 2
  (19, 13, 4)
• 3
  (24, 9, 11)
• 4
  (18, 7, 7)