Select the set in which the numbers are NOT related in the same way as are the numbers of the following set.
(NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into their constituent digits. E.g. 13 - Operations on 13 such as adding/substracting/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.)
(5, 13, 16)
(4, 11, 14)
1
(8, 13, 10)
2
(12, 21, 18)
3
(7, 17, 20)
4
(9, 21, 26)